The Ilkhanate: Mongol Rule, Government and Society in Iran

The Ilkhanate was the Mongol state founded in western Asia by Hülegü, a grandson of Genghis Khan. Its history as a distinct polity runs chiefly from the mid-thirteenth century to 1335. Its core lay in Iran, Azerbaijan and Iraq, while the extent and firmness of Ilkhanid authority varied across Anatolia, the Caucasus and other connected territories. Mongol forces had conquered much of the region before Hülegü arrived; his campaigns and the political settlement that followed turned these territories into the domain of his dynasty.

The Ilkhans ruled through a combination of Mongol military power and Persian-speaking administration. Their court moved among established cities and newer political centers, and their government drew resources from regions with different rulers and economic strengths. Over time, the dynasty adopted Islam, while continuing to engage with Mongol political traditions and other religions. These changes shaped the state’s institutions, building projects and cultural life, but did not make the Ilkhanate a uniform or enduring empire.

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From Mongol conquest to a regional khanate

Mongol expansion into western Asia began decades before Hülegü’s campaign. After the invasion of the Khwarazmian Empire in 1219, Mongol armies extended their power through Persia, the Caucasus and neighboring lands. Some local rulers submitted and paid tribute; others were defeated. By the time Hülegü was sent west, Mongol commanders had already established a military presence and a network of subordinate territories.

Hülegü, brother of Great Khan Möngke, led the campaign that took the main Nizari Ismaili strongholds in 1256 and Baghdad in 1258. His army entered Syria early in 1260, but he withdrew with much of it to Azerbaijan. The Mamluks defeated the remaining force at Ain Jalut later that year. Later Ilkhanid invasions similarly failed to establish lasting control of Syria.

At first, Hülegü’s territory remained part of the wider Mongol Empire. After the death of the Great Khan, however, the western domain became increasingly autonomous. Mongol sources called it the ulus of Hülegü, meaning the territory or people associated with his line. The Ilkhanate was therefore distinct both from the earlier united empire and from other Mongol successor states, including the Yuan dynasty in China, the Golden Horde and the Chagatai Khanate. The Yuan ruler retained a claim to senior authority, but the Ilkhans governed their western realm in practice.

Dynastic rule and regional authority

Hülegü’s descendants ruled until the death of Abu Sa’id in 1335. Succession was not always straightforward: rival princes and powerful military leaders could support different candidates, and rulers also faced conflict with other Mongol dynasties. The Golden Horde fought the Ilkhans in the Caucasus, while the Chagatai rulers challenged them to the east. These conflicts tied the Ilkhanate to the wider Mongol political world even as they constrained its ambitions.

Ilkhanid control did not operate in the same way everywhere. The dynasty directly administered many areas of Iraq, the Caucasus and western and southern Iran, but some local rulers retained authority. The Kart dynasty around Herat, for example, remained autonomous, as did other regional powers. Mongol military groups also held substantial authority in parts of the realm. Such arrangements meant that the khan’s reach depended on negotiation and military relationships as well as formal claims of rule.

The court’s principal centers changed over time. Maragheh served as a base under Hülegü and his immediate successors, Tabriz became a major capital and commercial center, and Soltaniyeh was established as a later capital from 1306. The rulers also promoted an idea of territorial kingship rooted in Iranian history. Persian historians presented the Mongol dynasty as an heir to earlier Iranian empires, including the Sasanian Empire. Claims to an Iranian imperial inheritance helped present the Mongol dynasty as a legitimate territorial monarchy.

Government, taxation and administration

Ilkhanid government joined Mongol princes and military officers with administrators experienced in Persian political and fiscal practices. Persian was widely used in administration and writing, while Mongolian remained important at court and in the ruling dynasty. Official documents could also use Turkic or Arabic. The chancery, or office responsible for state documents, retained conventions shared with other Mongol governments. Ilkhanid rulers used seals and titles that reflected both their western authority and continuing connections with the Yuan court.

Revenue came from agriculture, livestock, towns and trade. Tax-farmers might advance money or supply guarantees in return for the right to collect an agreed revenue. Provincial drafts and extraordinary demands added to the burden. Ghazan’s programme sought recorded assessments and tighter limits on collection, linking government finances with the stability of production.

Persian-speaking officials could rise to high office, including the Jewish vizier Sa’d al-Dawla and Rashid al-Din, a convert from Judaism to Islam. Rashid helped carry out Ghazan’s reforms and wrote about their success. Other evidence shows that recovery varied across regions, while officials’ fortunes continued to depend on court alliances.

Religion and the changing basis of rule

Religious life changed substantially during Ilkhanid rule. The court and Mongol elite initially included Buddhists and adherents of Mongol religious traditions, while Christians, Muslims and other communities lived under Ilkhanid authority. Tekuder, who ruled from 1282 to 1284, was the first Ilkhan to become Muslim, but he did not attempt a general conversion. His reign also showed that a ruler’s religious identity could become entangled with struggles for support among Mongol nobles and the army.

Ghazan’s conversion to Islam in 1295 redirected court patronage towards Muslim institutions. Buddhist temples, churches and synagogues suffered attacks, and non-Muslim communities faced new pressures. Later interventions relaxed some measures and restored protection. Religious policy shifted with court politics and the influence of officials and religious leaders.

Öljaitü, Ghazan’s successor, had earlier been baptized as a Christian and had also been associated with Buddhism. He later became a Muslim and, in 1309–10, adopted Shi’a Islam. His changing affiliations illustrate the unsettled nature of religious politics at court. Sufi Muslim leaders could receive favor, while Buddhist communities remained present after Ghazan’s policies. The Ilkhanate’s religious history was thus a process of conversion, patronage and pressure, not a uniform change imposed everywhere at the same pace.

Resources, cities and long-distance exchange

Agriculture supplied rural households, towns and state revenue. Keeping land productive required irrigation maintenance and labour as well as access to fields. Rashid al-Din’s Tabriz foundation assigned gardeners and workers to clear underground water channels. Such obligations connected endowed property with daily food and services.

Ilkhanid links with the Yuan court connected western Asia to political and commercial exchanges across the Mongol world. The two courts shared documentary forms and exchanged officials and seals. Ilkhanid coins also reflected changing claims of authority: early rulers included the Great Khan’s name, while Ghazan generally omitted it, though coins from Georgia retained a Mongol formula naming the Great Khan. Such changes in official objects show how rulers balanced their own authority with inherited Mongol affiliations.

Architecture, learning and religious institutions

Ilkhanid building patronage developed earlier Iranian architectural traditions. Brick remained a principal building material, while colored tile mosaic brought additional pattern and color to walls and surfaces. Craftspeople cut tiles of different colors into pieces and fitted them together to form geometric and floral designs. Builders also used taller interiors and more elaborate vaulting. Muqarnas, a form of layered architectural ornament, came to cover whole domes and vaults as well as smaller transitional spaces.

Mosques often followed the four-iwan plan, in which vaulted halls open onto a courtyard. In the northwest, colder winters encouraged different arrangements, including mosques without an open courtyard. Monumental portals and domed prayer halls also became prominent features. These buildings were part of a wider culture of patronage in which rulers and officials supported religious architecture, though regional conditions shaped what builders constructed and how they used space.

Learning received royal and ministerial support. The observatory founded at Maragheh in 1259 combined instruments, calculation, teaching and a library under Nasir al-Din al-Tusi. Rashid al-Din directed the Compendium of Chronicles, begun as a history of the Mongols under Ghazan and expanded under Öljaitü. Scribes, painters and supervisors worked together on its manuscripts.

Ilkhanid rulers and officials also supported religious learning beyond their own territories. In the 1320s, Chupan undertook the pilgrimage to Mecca and sponsored repairs to its water supply, as well as a college for religious learning and a bathhouse in Medina. These projects formed part of a wider effort by Abu Sa’id and his officials to assert influence in the holy cities, where the Mamluk sultans also promoted their authority.

Courts, armies and Eurasian connections

The Ilkhanid court combined a mobile Mongol ruling elite with the institutions of settled cities. Mongol rulers and military leaders maintained political and military ties across the Caucasus, Iran, Iraq and Central Asia, while Persian officials managed much of the written administration. The state’s armies fought both local rebellions and rival Mongol powers. Its conflict with the Mamluk Sultanate over Syria lasted through changes in rulers and religion; the Ilkhans’ conversion to Islam did not end that rivalry.

Diplomatic contact also extended beyond the Mongol world. Western European rulers and church leaders made repeated attempts to cooperate with the Mongols, in part against the Mamluks, but no formal alliance followed. Within the Mongol world, by contrast, political links were institutional as well as diplomatic: after a general peace among the khanates in 1304, the Ilkhans acknowledged the Yuan emperor’s nominal supremacy while continuing to govern autonomously.

Fragmentation after 1335

Abu Sa’id died without a son in 1335. Commanders and factions backed rival claimants, and the state fragmented into competing regional powers. The Jalayirids and Chobanids were among those struggling over former Ilkhanid centres. Cities, workshops and endowed institutions continued through these changes under new political patrons.

For the wider setting, see Ilkhanate.