Ilkhanate

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Name: Ilkhanate (Hülegü Ulus / Ilkhanan, c. 1256 – 1335, zombie khans until c. 1357)

Predecessors:

• Mongol Empire
• Abbasid Caliphate
• Nizari Ismaili state (the Assassins)
• Sultanate of Rum (as overlord)

Successors:

• Jalayirid Sultanate
• Chobanids
• Muzaffarid dynasty
• Injuids
• Sarbadars
• Kartid dynasty

TL;DR

The Ilkhanate was the Mongol franchise branch for Persia, Iraq, the Caucasus, and Anatolia, founded when the Great Khan Möngke sent his brother Hülegü west in the 1250s with two work orders: destroy the Assassins, and make the Abbasid Caliph acknowledge Mongol supremacy. Hülegü completed both tickets with catastrophic thoroughness — the mountain fortresses of the Nizaris fell one by one, and in 1258 Baghdad, seat of the caliphate for five centuries, was sacked so comprehensively that Islamic historiography still treats it as a civilizational trauma marker.

The name is the mission statement: Ilkhan means something like “subordinate khan,” a polite fiction that Hülegü’s house was merely the Toluid family’s western office reporting to the Yuan headquarters of his brother Kublai. In practice, once the Mongol Empire fractured in the 1260s, the Ilkhanate was an independent Persian empire run by Mongols — fighting the Golden Horde over the Caucasus, fighting the Mamluks over Syria, and fighting the Chagatai Khanate over Khorasan, which is an impressive commitment to feuding exclusively with cousins.

Then came the twist: the dynasty of the man who burned Baghdad converted to Islam. Ghazan made it official in 1295, rebranded the state from occupying force to Persian-Islamic monarchy, and his vizier Rashid al-Din wrote what is arguably the first world history. And after all that adaptation, the Ilkhanate died not by conquest but by biology — Abu Sa’id died in 1335 without a son, and the empire simply dissolved into its own commanders’ severance packages.

Hülegü’s Two Tickets

The expedition that created the Ilkhanate was the last great coordinated Mongol conquest, and it moved with terrifying institutional competence: engineers, siege trains, a thousand crews of Chinese catapult specialists, and pasture logistics planned years in advance.

Ticket one, the Nizari Ismailis, had spent two centuries as the Middle East’s most feared political actors, assassinating viziers and sultans from impregnable mountain castles like Alamut. Hülegü reduced them in about a year, mostly by convincing the young Imam Rukn al-Din Khurshah to surrender his fortress network, after which the Mongols dismantled it anyway.¹

Ticket two was Baghdad. Caliph al-Musta’sim chose defiance on the advice of officials who badly misjudged what was coming. In February 1258 the city fell, the libraries and canals suffered along with the population, and the caliph was executed — by most accounts rolled in a carpet and trampled, because Mongol custom forbade spilling royal blood on the ground. Etiquette as loophole.

The Cousin Wars

Expansion stopped almost immediately, and the reasons were all family.

In 1260, with Hülegü distracted by the succession crisis after Möngke’s death, a reduced Mongol force was beaten by the Mamluks at Ain Jalut — the famous “first major Mongol defeat,” which mattered less as a military miracle and more because the Mongols never again concentrated full force on Syria. Why not? Because the Golden Horde‘s khan Berke, a Muslim, was so outraged by Baghdad and by disputed Caucasus pastures that he went to war with Hülegü and even allied with the Mamluks — the first open war between Mongol successor states.

So the Ilkhanate spent its whole life in a three-front cousin feud: Golden Horde to the north, Chagataids to the east, Mamluks (with Golden Horde diplomatic backing) to the southwest. This is also why the Ilkhans kept writing letters to the Pope and the kings of France and England proposing a Franco-Mongol alliance against Egypt. The Crusader powers never quite committed, and the correspondence reads today like two parties enthusiastically scheduling a meeting neither will attend.

The Conversion Speedrun

The early Ilkhans ran a genuinely multi-confessional court — Buddhist temples in Persia, Nestorian Christian queens, shamanist rites, and Muslim bureaucrats keeping the books. Hülegü’s chief wife Doquz Khatun was Christian, and Eastern Christians initially hailed the dynasty as liberators from the caliphate.

It couldn’t last, because the tax base was Muslim and the countryside was Muslim and the cities were Muslim. In 1295 Ghazan, coached by the amir Nawruz, converted to Islam along with his army, took the name Mahmud, and turned conversion into state policy. Buddhist clergy were expelled or converted; the dynasty that had executed the caliph now minted coins with the shahada on them. Within a single generation the Ilkhanate went from “scourge of Islam” to “Persian-Islamic monarchy with steppe characteristics” — one of the fastest legitimacy pivots in medieval history.

Ghazan paired the rebrand with real reform: fixed tax schedules, standardized coinage and weights, a postal system purged of freeloading princes, and agricultural revival programs. Persia’s economy, wrecked by decades of extraction, actually recovered. There was even a spectacular failure worth remembering: his predecessor Gaykhatu tried to fix a fiscal crisis in 1294 by introducing Chinese-style paper money (chao) to Tabriz. Merchants simply closed the bazaars, the economy stopped, and the experiment died within months, shortly followed by Gaykhatu himself.

The Historian-Vizier

The Ilkhanate’s most durable export was written by its finance minister. Rashid al-Din Hamadani — physician, convert from Judaism, vizier under Ghazan and Öljaitü — compiled the Jami’ al-Tawarikh (“Compendium of Chronicles”), a history not just of the Mongols but of the Chinese, Indians, Jews, Franks, and Turks, assembled with informants from across Eurasia. It is a reasonable candidate for the first attempt at a genuine world history, produced in a scriptorium-suburb of Tabriz that mass-copied illustrated editions annually.

His reward was the standard one for Ilkhanid viziers: rivals engineered his execution in 1318, at age about seventy, on charges of poisoning a khan. Nearly every chief minister of the Ilkhanate died by execution. The dynasty modernized its taxes long before it modernized its HR practices.

Abu Sa’id and the Full Stop

Öljaitü (who cycled through Christianity, Buddhism, Sunni Hanafism, Sunni Shafi’ism, and finally Shi’ism, treating theology as a subscription service) built a new capital at Soltaniyeh, where his mausoleum’s enormous dome still stands. His son Abu Sa’id took the throne as a boy in 1316 and grew into a competent ruler: he made peace with the Mamluks in 1323, ending six decades of war, and shook off his overmighty regent Chupan.

Then, in 1335, Abu Sa’id died — possibly poisoned, aged around thirty — while marching against a Golden Horde invasion. He had no son. Nine decades of Hülegüid rule turned out to have exactly one point of failure, and it was a family tree.

Trivia

• Marco Polo’s escort mission: The Polos left China escorting a bride, Kökechin, sent by Kublai for the Ilkhan Arghun. By the time the sea voyage ended, Arghun was dead, so she married his son Ghazan instead. Logistics in the 13th century.
• The observatory: Hülegü, destroyer of Baghdad, also built the Maragheh observatory for the polymath Nasir al-Din al-Tusi, whose planetary models (the “Tusi couple”) later show up, suspiciously unattributed, in Copernicus. Sack a library, fund a lab — portfolio diversification.
• Tabriz over Baghdad: The Ilkhans never ruled from Baghdad. Their capitals — Maragheh, Tabriz, Soltaniyeh — sat in Azerbaijan, close to the good pastures. Even Islamized, the dynasty still thought like people who needed somewhere to put the horses.
• Plague timing: The Ilkhanate collapsed just before The Black Death swept the region in the late 1340s, meaning post-Ilkhanid Persia got hit with dynastic fragmentation and pandemic back to back. The 14th century did not believe in pacing.

Power vacuum

The Ilkhanate’s death created the cleanest large-scale power vacuum of the late medieval Middle East, because nothing replaced it — the center simply stopped existing.

Within months of Abu Sa’id’s death in 1335, the great amirial families started crowning rival Hülegüid (and then increasingly random Genghisid) puppets. The Jalayirids took Baghdad and eventually Tabriz; the Chobanids, descendants of the executed regent Chupan, held Azerbaijan for a violent generation; the Muzaffarids carved out Fars and Isfahan; the Injuids ran Shiraz until the Muzaffarids ate them; the Kartids held Herat; and in Khorasan the Sarbadars ran a strange proto-populist Shi’ite statelet founded, more or less, by a tax revolt. Puppet khans were minted and discarded so quickly that numismatists use the coins to reconstruct which warlord held which city in which year.

The vacuum had three long consequences. First, it detached Anatolia: with no Ilkhanid overlord collecting tribute, the Turkish beyliks — including a small frontier outfit run by the house of Osman — were free to grow into the Ottoman Empire‘s founding generation. Second, it left Persia without any state strong enough to organize plague response, defense, or irrigation maintenance just as The Black Death arrived. Third, and most fatefully, it created the job opening that Timur applied for: when he erupted out of the ruins of the Chagatai Khanate in the 1380s, the former Ilkhanid space was a quarreling archipelago of successor statelets, none of which could resist him individually and none of which would ally sincerely. The Timurid Empire did not defeat the Ilkhanate’s successor; it defeated the absence of one.

There is a neat symmetry here. The Ilkhanate was born by destroying a hollow universal authority — the late Abbasid caliphate — and died by becoming one: a legitimacy shell that commanders wore until the fabric gave out. In both cases, the dangerous thing was not the empire. It was the empty chair.

Footnotes

1. The destruction of Alamut’s library is one of history’s great information losses — much of what we “know” about the Assassins was written by their enemies, partly because the Mongols burned the primary sources and kept the polemics. ↩