Cetashwayo
Lord of Ten Thousand Years
- Location
- Across the Horizon
Epistemology Warning: This is really old (I wrote it when I was 16), and synthesizes historical research in a mostly expository manner. Take it with something of a grain of salt.
Hey guys, I really enjoyed writing my stuff on SB, so I might as well transfer my main work on this forum over.
To expand on the Mongol devastation on Central Asia let's examine them in a tad more detail methodically. Central Asia isn't actually an adequate indicator- different areas were hit differently. Let's split it into several regions: Khwarezm, Sohgdia, Farghana & The Syr Darya, and Afghanistan.
1. Khwarezm: Khwarezm was the center of the Khwarezmshahs, a massive Turkic dynasty that had recently defeated the Ghaznavids, Khitay Khanate, and the Abbasids(as well as several Ashraf, such as Hamadan or Kermanshah). Khwarezm is naturally situated in the delta of the Amu Darya, whose long tendrils extend into the Aral sea. The center of this region was Urgench, still a sizable town today, and it was their capital. Multiple agricultural projects were undertaken, as noted by several writers of this era such as Ibn al-Athir. It was, essentially, the epitome of prosperity. The turkic raiders that harried the area were driven off, the empire's resources fueled the expansion of its libraries, and it rose to truly brilliant heights. This changed when the Mongols came.
Being the capital of a rich and wealthy empire, Urgench was hit first, and incredibly hard. It was said that hundreds of thousands of people were killed, but the veracity of this statement is in doubt, considering the entire population of Central Asia probably reached to around 3-4 million people. Nevertheless, immense damage was done to the area. The agricultural systems were completely and utterly wiped out. Salinization took hold, destroying huge amounts of previously fertile land. The Mongols poorly managed this area, and Urgench took on a comparatively small role. The fortresses which had guarded the delta fell into disrepair and multiple Turkic tribes streamed in. This kept the area comparatively undeveloped well into the modern era, when Khiva(further south on the Amu Darya) took a particular interest in it and began developing it. However, the resources of the Emir were quite limited and development never really took off. This area is now a backwater, a relic of a bygone age. Almost nothing of old Urgench survives, New Urgench is a dying town, and the Amu Darya flows into contaminated desert, the Aral sea shrinking back.
2. Soghdia: Soghdia was always the center of Central Asia, both economically and geographically. Resting on fertile soils in the upwaters of the Amu Darya, such places as Bukhara and Samarkand became famed all around Central Asia. Interestingly, Soghdia, regardless of its fame, got hit the least of the many regions of the middle east. While Samarkand and the surrounding area were subjected to raids, its importance(as well as Bukhara's) saved it. Due to it being on the silk road, placed rather conveniently, it was spared Mongol slaughter, but never regained its position as the great pivot upon which Central Asia turned. In time, Bukhara would assume that role, and Herat as well.
3. Farghana and the Syr Darya: This area was the frontier land of Transoxiana. The Syr Darya, being even less fit for farming than the Amu Darya, was thinly settled as one moved into the Kyzl Kum desert. However, along its upper reaches, several cities rose. During the Khwarezemid era, the relative relaxed nature of Khitay raids meant that it was possible for Otrar to develop as the center here. Many traders going to Kokkand or Kashgar found Otrar an almost unquestionable stopping point, as its strong walls and large population could both protect them and supply them. However, as the frontier, once the Khwarezmids collapsed, Otrar was left open to the nomadic tribes.
The Mongols were first, of course. They attacked it with an unrelenting force of many thousands of deadly warriors, pillaging it and(in the beliefs of some Islamic writers, it is likely that this was hyperbole to emphasize the destruction) used its walls to build monuments to the destruction. Otrar eventually recovered its place as a transit under the later Mongol rulers, but was destroyed again by multiple incursions during the instability of the Chagatai Khanate. It never managed to regain its position as a strong city due to the raids which continued until the Junghar invasions of the late 1700s. The Sur Darya remains a sun-beaten backwater, hiding its secrets in the sands of time.
Ferghana had a bit of a more lucky history. Farghana is a nestled valley east of the Syr Darya, where a number of city found a convenient place to set up shop. The southern passes to Kashgar lie here, allowing the traveler to traverse the many mountains blocking his arrival in East Turkestan. Spared the destruction that befell many other cities in the Mongols' way, Kokkand, the main city here, rose greatly in prominence. It was here that Sultan Babar controlled before he invaded India, and his rule(as well as that of Akbar) greatly enriched it. The Junghar invasions damaged it significantly, but it was spared the greatest of the destruction. However, the 19th century saw the decline of Kokkand along with the entire emirate as a whole. The fall of the silk trade, the encroachment of Russia, and the chaos in Afghanistan made it a city barely worth the ground it stood on. An unfortunate victim to stagnation and a position that was once a blessing, but now a curse.
4. Afghanistan: 'Oh, Afghanistan. How you have fallen so! What has happened to cities of Balkh and Kunduz? The gardens of Ghazni and Qandahar? The great palaces of Kabul? You are like a mistress who has lost her lover and weeps for her children.' - Chronicle of Ibn al-Athir, part 3, pg 98. Really, Aghanistan is the saddest of the bunch. Its cities were once claimed to be the most beautiful in the world. Under the Samanids, Ghaznavids, Kwharezemids, braggart princes in Balkh and Kabul alike vied for the largest gardens, the most beautiful cities, and the most wondrous libraries. The cities listed in Ibn al-Athir's passage are the most important, for they are the hardest hit. Balkh deserves special mention, since it was a city that had existed in some continuity since the 6th century BC, but was never resettled after the deprecation of the Mongols. It had a library that rivaled Baghdad, but we know nothing of it, so complete was the destruction the Mongols wrought.
The whole of Afghanistan from the 13th century on is a sorrowful story of destruction and defeat. The Mongols in their first attack mainly swept by the north, destroying the great cities of Balkh, Kunduz, and Herat. Afterwards, the son of the Khwarezmid Shah, Jalal ad-din, attempted to use the area to bolster his efforts in defeating the Mongols. They were largely in vain, as the Afghan tribes were angered at his lack of diplomatic skill, and refused to help him. This led the Mongols to chase him around Iran and eventually defeat him, but that's for later. For now, let's focus on what his arrival did. The Ghaznavids had been largely replaced in this area by local Ashraf who did not pay any attention to the power of the Ghaznavids and the Ghulam on the Gangetic plain. This meant they were awfully unprepared to fight the Mongols. First Ghazni, then Kabul and Qandahar. Herat was sacked in turn and took many decades to regain its position.
The most notable effect was that on Afghan psyche, land use, and urbanization. There had always been herders in Afghanistan, but these herders and rural farmers had generally kept to the fringes, or were relatively weak. Tribal life, while common in remote areas of Afghanistan, was superseded by the Urban centers of civilization in such fertile areas as the Northern plain and Kabul. True wonders were created in this area, and it was acknowledged as the richest area of central asia, challenging even Persia's supremacy. It is estimated that the current urban:rural ratio is less than it was before the Mongols came. That's saying something.
The Mongols destroyed the land routes and urban centers, and the loss of the silk trade forced the urbanites who survived to live off the land. Highly productive land that could have been used for farming was instead used for herding, resulting in the total loss of all fertility in the southwest. Farah and Zaranj, once great leaders of the area of Baluchistan, became little more than little villages, barely etching out a living off the land. The Mongols absolutely destroyed Afghan urban life, and terrified the Afghans. The invasions by Timur, Babur, Nader Shah, the Junghars, and so on, only confirmed their paranoia. It is no wonder that the Taliban are a product of such a culture- it has been suffering post-traumatic stress disorder for several hundred years.
--
Since I want to share this as an original thread in the War room, I'm going to, as promised, extend to this to such areas as Iran, Iraq, Georgia, Eastern Anatolia, and Syria. Enjoy.
Iran – Before the Mongol conquests, Iran was undergoing a transition period, a practical mess and a great battleground. Following the fall of the Seljuk Turks, Iran turned into an anarchic battleground for the various ashraf that called it home, weakening Iran's power in the Middle East and reducing its position. With the rise of the Khwarezmid shahs, Iran became a massive battlefield between them and the resurgent Abbasids, who had taken upon themselves to fight the expanding Turkic power. Near Rayy they thought, and according to Ibn al-Athir, the battle was fairly inconclusive. The fighting continued for several years and was a fairly vague recollection, not something very focused on, but in the end, the Khwarezmid proved victorious. Now there was a new period of power and glory brought to the Iranian plateau, but it would not last long.
Rayy, once one of the principal cities of the Middle East and capital of the Seljuq Dynasty was left moribund after the wars of the last 12th century and the anarchy of the early 13th. The invasion of the Khwarezmid dynasty allowed some measure of peace to return, but the old wealth of Rayy was lost and forgotten. Never again would it shine like it did for the Seljuks, and while valuable militarily (lying in a small corridor from western to eastern Iran, pinched in the north by mountains and in the south by desert) it would fade out of existence as time went on. The Mongol arrival did little to help its chances; the inhabitants fled from their dwellings in the villages around they had abandoned the main town due to its control by warlords) and now they disappeared for good. Rayy was left fairly unscathed by the Mongols, but there wasn't much to pillage. It was already, after all, a dying city. Teheran surpassed it, and in 1533, with an Uzbek raid into the area, the finishing of Teheran's walls ended any validity Rayy had for its existence.
Eshafan was a city with much better prospects. Like Rayy it had been the capital of the Seljuq Turks during its long history, but unlike it, grandeur stayed with it after their fall. Becoming one of the most important cities of the Salghurids, a dynasty of Ashraf that managed to outlive the Mongols well into the era of the Timurids, it managed to hold a special significance and was incredibly important for its central position on the plateau. When the Khwarezmids conquered it, it became the natural dual capital of the west, like Urgench in the east. This, however, had some unfortunate consequences for the city.
Due to its important position, it became a prime military target. However, unlike Rayy, it became the center of one of the Middle East's greatest stands against the Mongols until the Mamluks. At first, following the death of the Shah of Khwarizm after the Mongol invasion, it became under the control of his second son. He ruled the area for a few months or so, until the eldest son, Jalal ad-din, thundered into the area after hiding among Afghan tribes. The fight between them was bloodless, as the officers of the younger son's army immediately deserted him for the passionate and charismatic Jalal ad-din, and the younger son resigned himself, allowing himself to assist Jalal in the battle against the Mongols.
Jalal was particularly interesting because he was one of the only people who could confidently take on the Mongols, lose, and come right back up again. He fought them in the Elburz (a mountain range north of Teheran) and lost, only to continue. When the Mongols went back home to decide upon a new Khan, it gave Jalal the breathing room he needed to consolidate, and he didn't skip a beat. He attacked and pillaged Tbilisi, the capital of the Georgians, ending swiftly the carefully constructed hegemony of Queen Tamar (more on that later). He did not stop there, oh no; he then took the fight to the Egyptian dynasty of the Ayyubids and the Sultanate of Rum in Anatolia. There he fought them to a standstill until a battle in the Van region, where he was defeated and his state began to crumble around him.
After that battle, the Ayyubids unfortunately welcomed their own deaths. The battle sufficiently weakened Jalal's army to the point where the Mongols could now confidently go on the offensive, swiping his newly built empire from him and crushing his forces. Eshafan fell to them and they massacred the population. The fall of Jalal ad-din's empire essentially created a corridor for the Mongols so that they could thunder into the near east and Anatolia without much issue. The Ayyubid victory would turn to damage them in a great historical irony, sweeping away their state as they struggled to fight the Mamluks in Egypt.
The fall of Iran was not actually that much damaging to the area as it seemed to be. Although the population fell by a very substantial amount (5 million before and 3.5 million after in some estimates) it wasn't the initial Mongol invasion which caused the real damage to the area. It was the catalyst that the Mongols provided, by opening the floodgates, so to speak, for nomadic invasions. In addition, the Mongol invasion allowed a switch from agrarian to pastoral practices, such as Afghanistan. Iran still had a very important position in the Middle East so it did not turn to rural structures so much as Afghanistan, but it still switched over. This unrelenting pastoralism also took another toll on Iran: It weakened the fertility of the soil. Large amounts of previously fertile land were turned into rough grazing land or semi-desert due to unsustainable herding practices.
Of course, it was not simply the locals which turned to pastoralism. It was during this time that a large amount of tribes came into the Iranian plateau, either piggybacking with the Mongols or being mercenaries called in. While there had been a significant expansion of Turks within the Iranian plateau before, it now exploded into levels never seen before. Due to this, a large amount of Iran's population is now in fact Turkish, such as the Luris or the Qarqai. Like in Central Asia, Turkic tribes managed to expand and take areas formerly held by Iranian landlords, thereby switching the balance in their favor. In Iran, obviously the amount of Persians (speaking of the ethnicity) was far higher, so it was difficult for such a transition to take place. They still took a fairly predominant role in society, however.
Iran would continue to be the base of great empires, but also the subject of massive massacres. The Mongol invasions ushered in a period of instability, as the il-Khans were not the most competent of rulers. Though there were a few, such as Ghazan, who allowed some measure of peace to return to the plateau, it would not know true security until the Safavids in the 16th century took it from the myriad of Turkish rulers disputing it (such as the White Sheep Turks). It was obvious the mark that the Mongols took on the land, but in the words of Ibn al-Athir on the fall of Eshafan: 'She is a strong land, that Iran. She shall survive and emerge stronger than she had been before, for it is her way. Iran does not stop to think of her torture, but continues on into the future.'
Watch this post for updates on Iraq, Georgia, Khorasan (northeastern Iran, I'd like to cover it more detail since I skimped over it in this post) and various other places. If you'd like to ask a question, a comment, a criticism, or whatever, go right ahead. For this I've used mainly the Chronicle of Ibn al-Athir, The Cambridge History of Iran, and a number of other works.
Hey guys, I really enjoyed writing my stuff on SB, so I might as well transfer my main work on this forum over.
To expand on the Mongol devastation on Central Asia let's examine them in a tad more detail methodically. Central Asia isn't actually an adequate indicator- different areas were hit differently. Let's split it into several regions: Khwarezm, Sohgdia, Farghana & The Syr Darya, and Afghanistan.
1. Khwarezm: Khwarezm was the center of the Khwarezmshahs, a massive Turkic dynasty that had recently defeated the Ghaznavids, Khitay Khanate, and the Abbasids(as well as several Ashraf, such as Hamadan or Kermanshah). Khwarezm is naturally situated in the delta of the Amu Darya, whose long tendrils extend into the Aral sea. The center of this region was Urgench, still a sizable town today, and it was their capital. Multiple agricultural projects were undertaken, as noted by several writers of this era such as Ibn al-Athir. It was, essentially, the epitome of prosperity. The turkic raiders that harried the area were driven off, the empire's resources fueled the expansion of its libraries, and it rose to truly brilliant heights. This changed when the Mongols came.
Being the capital of a rich and wealthy empire, Urgench was hit first, and incredibly hard. It was said that hundreds of thousands of people were killed, but the veracity of this statement is in doubt, considering the entire population of Central Asia probably reached to around 3-4 million people. Nevertheless, immense damage was done to the area. The agricultural systems were completely and utterly wiped out. Salinization took hold, destroying huge amounts of previously fertile land. The Mongols poorly managed this area, and Urgench took on a comparatively small role. The fortresses which had guarded the delta fell into disrepair and multiple Turkic tribes streamed in. This kept the area comparatively undeveloped well into the modern era, when Khiva(further south on the Amu Darya) took a particular interest in it and began developing it. However, the resources of the Emir were quite limited and development never really took off. This area is now a backwater, a relic of a bygone age. Almost nothing of old Urgench survives, New Urgench is a dying town, and the Amu Darya flows into contaminated desert, the Aral sea shrinking back.
2. Soghdia: Soghdia was always the center of Central Asia, both economically and geographically. Resting on fertile soils in the upwaters of the Amu Darya, such places as Bukhara and Samarkand became famed all around Central Asia. Interestingly, Soghdia, regardless of its fame, got hit the least of the many regions of the middle east. While Samarkand and the surrounding area were subjected to raids, its importance(as well as Bukhara's) saved it. Due to it being on the silk road, placed rather conveniently, it was spared Mongol slaughter, but never regained its position as the great pivot upon which Central Asia turned. In time, Bukhara would assume that role, and Herat as well.
3. Farghana and the Syr Darya: This area was the frontier land of Transoxiana. The Syr Darya, being even less fit for farming than the Amu Darya, was thinly settled as one moved into the Kyzl Kum desert. However, along its upper reaches, several cities rose. During the Khwarezemid era, the relative relaxed nature of Khitay raids meant that it was possible for Otrar to develop as the center here. Many traders going to Kokkand or Kashgar found Otrar an almost unquestionable stopping point, as its strong walls and large population could both protect them and supply them. However, as the frontier, once the Khwarezmids collapsed, Otrar was left open to the nomadic tribes.
The Mongols were first, of course. They attacked it with an unrelenting force of many thousands of deadly warriors, pillaging it and(in the beliefs of some Islamic writers, it is likely that this was hyperbole to emphasize the destruction) used its walls to build monuments to the destruction. Otrar eventually recovered its place as a transit under the later Mongol rulers, but was destroyed again by multiple incursions during the instability of the Chagatai Khanate. It never managed to regain its position as a strong city due to the raids which continued until the Junghar invasions of the late 1700s. The Sur Darya remains a sun-beaten backwater, hiding its secrets in the sands of time.
Ferghana had a bit of a more lucky history. Farghana is a nestled valley east of the Syr Darya, where a number of city found a convenient place to set up shop. The southern passes to Kashgar lie here, allowing the traveler to traverse the many mountains blocking his arrival in East Turkestan. Spared the destruction that befell many other cities in the Mongols' way, Kokkand, the main city here, rose greatly in prominence. It was here that Sultan Babar controlled before he invaded India, and his rule(as well as that of Akbar) greatly enriched it. The Junghar invasions damaged it significantly, but it was spared the greatest of the destruction. However, the 19th century saw the decline of Kokkand along with the entire emirate as a whole. The fall of the silk trade, the encroachment of Russia, and the chaos in Afghanistan made it a city barely worth the ground it stood on. An unfortunate victim to stagnation and a position that was once a blessing, but now a curse.
4. Afghanistan: 'Oh, Afghanistan. How you have fallen so! What has happened to cities of Balkh and Kunduz? The gardens of Ghazni and Qandahar? The great palaces of Kabul? You are like a mistress who has lost her lover and weeps for her children.' - Chronicle of Ibn al-Athir, part 3, pg 98. Really, Aghanistan is the saddest of the bunch. Its cities were once claimed to be the most beautiful in the world. Under the Samanids, Ghaznavids, Kwharezemids, braggart princes in Balkh and Kabul alike vied for the largest gardens, the most beautiful cities, and the most wondrous libraries. The cities listed in Ibn al-Athir's passage are the most important, for they are the hardest hit. Balkh deserves special mention, since it was a city that had existed in some continuity since the 6th century BC, but was never resettled after the deprecation of the Mongols. It had a library that rivaled Baghdad, but we know nothing of it, so complete was the destruction the Mongols wrought.
The whole of Afghanistan from the 13th century on is a sorrowful story of destruction and defeat. The Mongols in their first attack mainly swept by the north, destroying the great cities of Balkh, Kunduz, and Herat. Afterwards, the son of the Khwarezmid Shah, Jalal ad-din, attempted to use the area to bolster his efforts in defeating the Mongols. They were largely in vain, as the Afghan tribes were angered at his lack of diplomatic skill, and refused to help him. This led the Mongols to chase him around Iran and eventually defeat him, but that's for later. For now, let's focus on what his arrival did. The Ghaznavids had been largely replaced in this area by local Ashraf who did not pay any attention to the power of the Ghaznavids and the Ghulam on the Gangetic plain. This meant they were awfully unprepared to fight the Mongols. First Ghazni, then Kabul and Qandahar. Herat was sacked in turn and took many decades to regain its position.
The most notable effect was that on Afghan psyche, land use, and urbanization. There had always been herders in Afghanistan, but these herders and rural farmers had generally kept to the fringes, or were relatively weak. Tribal life, while common in remote areas of Afghanistan, was superseded by the Urban centers of civilization in such fertile areas as the Northern plain and Kabul. True wonders were created in this area, and it was acknowledged as the richest area of central asia, challenging even Persia's supremacy. It is estimated that the current urban:rural ratio is less than it was before the Mongols came. That's saying something.
The Mongols destroyed the land routes and urban centers, and the loss of the silk trade forced the urbanites who survived to live off the land. Highly productive land that could have been used for farming was instead used for herding, resulting in the total loss of all fertility in the southwest. Farah and Zaranj, once great leaders of the area of Baluchistan, became little more than little villages, barely etching out a living off the land. The Mongols absolutely destroyed Afghan urban life, and terrified the Afghans. The invasions by Timur, Babur, Nader Shah, the Junghars, and so on, only confirmed their paranoia. It is no wonder that the Taliban are a product of such a culture- it has been suffering post-traumatic stress disorder for several hundred years.
--
Since I want to share this as an original thread in the War room, I'm going to, as promised, extend to this to such areas as Iran, Iraq, Georgia, Eastern Anatolia, and Syria. Enjoy.
Iran – Before the Mongol conquests, Iran was undergoing a transition period, a practical mess and a great battleground. Following the fall of the Seljuk Turks, Iran turned into an anarchic battleground for the various ashraf that called it home, weakening Iran's power in the Middle East and reducing its position. With the rise of the Khwarezmid shahs, Iran became a massive battlefield between them and the resurgent Abbasids, who had taken upon themselves to fight the expanding Turkic power. Near Rayy they thought, and according to Ibn al-Athir, the battle was fairly inconclusive. The fighting continued for several years and was a fairly vague recollection, not something very focused on, but in the end, the Khwarezmid proved victorious. Now there was a new period of power and glory brought to the Iranian plateau, but it would not last long.
Rayy, once one of the principal cities of the Middle East and capital of the Seljuq Dynasty was left moribund after the wars of the last 12th century and the anarchy of the early 13th. The invasion of the Khwarezmid dynasty allowed some measure of peace to return, but the old wealth of Rayy was lost and forgotten. Never again would it shine like it did for the Seljuks, and while valuable militarily (lying in a small corridor from western to eastern Iran, pinched in the north by mountains and in the south by desert) it would fade out of existence as time went on. The Mongol arrival did little to help its chances; the inhabitants fled from their dwellings in the villages around they had abandoned the main town due to its control by warlords) and now they disappeared for good. Rayy was left fairly unscathed by the Mongols, but there wasn't much to pillage. It was already, after all, a dying city. Teheran surpassed it, and in 1533, with an Uzbek raid into the area, the finishing of Teheran's walls ended any validity Rayy had for its existence.
Eshafan was a city with much better prospects. Like Rayy it had been the capital of the Seljuq Turks during its long history, but unlike it, grandeur stayed with it after their fall. Becoming one of the most important cities of the Salghurids, a dynasty of Ashraf that managed to outlive the Mongols well into the era of the Timurids, it managed to hold a special significance and was incredibly important for its central position on the plateau. When the Khwarezmids conquered it, it became the natural dual capital of the west, like Urgench in the east. This, however, had some unfortunate consequences for the city.
Due to its important position, it became a prime military target. However, unlike Rayy, it became the center of one of the Middle East's greatest stands against the Mongols until the Mamluks. At first, following the death of the Shah of Khwarizm after the Mongol invasion, it became under the control of his second son. He ruled the area for a few months or so, until the eldest son, Jalal ad-din, thundered into the area after hiding among Afghan tribes. The fight between them was bloodless, as the officers of the younger son's army immediately deserted him for the passionate and charismatic Jalal ad-din, and the younger son resigned himself, allowing himself to assist Jalal in the battle against the Mongols.
Jalal was particularly interesting because he was one of the only people who could confidently take on the Mongols, lose, and come right back up again. He fought them in the Elburz (a mountain range north of Teheran) and lost, only to continue. When the Mongols went back home to decide upon a new Khan, it gave Jalal the breathing room he needed to consolidate, and he didn't skip a beat. He attacked and pillaged Tbilisi, the capital of the Georgians, ending swiftly the carefully constructed hegemony of Queen Tamar (more on that later). He did not stop there, oh no; he then took the fight to the Egyptian dynasty of the Ayyubids and the Sultanate of Rum in Anatolia. There he fought them to a standstill until a battle in the Van region, where he was defeated and his state began to crumble around him.
After that battle, the Ayyubids unfortunately welcomed their own deaths. The battle sufficiently weakened Jalal's army to the point where the Mongols could now confidently go on the offensive, swiping his newly built empire from him and crushing his forces. Eshafan fell to them and they massacred the population. The fall of Jalal ad-din's empire essentially created a corridor for the Mongols so that they could thunder into the near east and Anatolia without much issue. The Ayyubid victory would turn to damage them in a great historical irony, sweeping away their state as they struggled to fight the Mamluks in Egypt.
The fall of Iran was not actually that much damaging to the area as it seemed to be. Although the population fell by a very substantial amount (5 million before and 3.5 million after in some estimates) it wasn't the initial Mongol invasion which caused the real damage to the area. It was the catalyst that the Mongols provided, by opening the floodgates, so to speak, for nomadic invasions. In addition, the Mongol invasion allowed a switch from agrarian to pastoral practices, such as Afghanistan. Iran still had a very important position in the Middle East so it did not turn to rural structures so much as Afghanistan, but it still switched over. This unrelenting pastoralism also took another toll on Iran: It weakened the fertility of the soil. Large amounts of previously fertile land were turned into rough grazing land or semi-desert due to unsustainable herding practices.
Of course, it was not simply the locals which turned to pastoralism. It was during this time that a large amount of tribes came into the Iranian plateau, either piggybacking with the Mongols or being mercenaries called in. While there had been a significant expansion of Turks within the Iranian plateau before, it now exploded into levels never seen before. Due to this, a large amount of Iran's population is now in fact Turkish, such as the Luris or the Qarqai. Like in Central Asia, Turkic tribes managed to expand and take areas formerly held by Iranian landlords, thereby switching the balance in their favor. In Iran, obviously the amount of Persians (speaking of the ethnicity) was far higher, so it was difficult for such a transition to take place. They still took a fairly predominant role in society, however.
Iran would continue to be the base of great empires, but also the subject of massive massacres. The Mongol invasions ushered in a period of instability, as the il-Khans were not the most competent of rulers. Though there were a few, such as Ghazan, who allowed some measure of peace to return to the plateau, it would not know true security until the Safavids in the 16th century took it from the myriad of Turkish rulers disputing it (such as the White Sheep Turks). It was obvious the mark that the Mongols took on the land, but in the words of Ibn al-Athir on the fall of Eshafan: 'She is a strong land, that Iran. She shall survive and emerge stronger than she had been before, for it is her way. Iran does not stop to think of her torture, but continues on into the future.'
Watch this post for updates on Iraq, Georgia, Khorasan (northeastern Iran, I'd like to cover it more detail since I skimped over it in this post) and various other places. If you'd like to ask a question, a comment, a criticism, or whatever, go right ahead. For this I've used mainly the Chronicle of Ibn al-Athir, The Cambridge History of Iran, and a number of other works.
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