Conversion of Ghazan Khan and the Ilkhanate

# Ghazan Khan: The Ilkhanate's Conversion and Islam's Triumph Over Its Conquerors

The Conquerors Become the Faithful

In 656 AH (1258 CE), the Mongol army of Hulagu Khan destroyed Baghdad, killed the Abbasid Caliph, and ended the Abbasid dynasty that had ruled the Islamic world for over five centuries. Hulagu and the Ilkhanate he founded were, at that moment, among the most powerful enemies Islam had ever faced — pagan rulers allied with Nestorian Christians and Buddhists, governing a state carved from the heart of the Islamic world by the most destructive military campaign in human history.

Thirty-seven years later, in 694 AH (1295 CE), Hulagu's grandson Mahmud Ghazan Khan converted to Sunni Islam, assumed the name Mahmud, and made Islam the official religion of the Ilkhanate. The state that had destroyed the Abbasid Caliphate became a Muslim state. The conquerors had been conquered — not by armies but by the message of the Quran carried by Muslims who continued to live and practice their faith under Mongol rule.

This transformation is among the most remarkable in Islamic history and stands as one of the most powerful demonstrations of the vitality of the Islamic message. The Prophet ﷺ said: "Allah will bring to this religion men who have no share in it" — meaning that Islam grows through converts from unexpected sources. No convert was more unexpected, or more consequential, than the Ilkhan of Persia.

The Ilkhanate Before Ghazan

The Ilkhanate (Persian: Il-Khanate, meaning "subordinate Khan's domain") was established by Hulagu Khan after his campaigns through Persia and Iraq (651-656 AH / 1253-1258 CE). It stretched from the Oxus River in the east to Anatolia in the west, from the Caucasus in the north to the Persian Gulf in the south — essentially the territories of modern Iran, Iraq, Azerbaijan, Armenia, Georgia, and parts of Turkey and Afghanistan.

The early Ilkhans maintained a complex religious policy: they were shamanists by traditional Mongol practice but were generally tolerant of multiple religions. Hulagu's wife Dokuz Khatun was a Nestorian Christian who enjoyed extraordinary influence and reportedly obtained the destruction of mosques in Baghdad while churches and their congregations were protected after the conquest. Later Ilkhans oscillated between Buddhism, shamanism, and nominal acknowledgment of Islam.

The Muslim population of the Ilkhanate — the overwhelming majority of the people they governed — lived under rulers who were not only non-Muslim but who had killed their Caliph and destroyed their most sacred political institution. This created extraordinary social and religious tensions. Muslim scholars continued to function under Mongol patronage, but on terms set by non-Muslim rulers. The Mongol legal code (Yasa) ran parallel to Islamic law, often in direct conflict with it.

Ibn Taymiyyah's famous fatwa declaring that the Mongols of his time — despite some nominal Muslim identity — remained kafirs because they governed by Yasa rather than Islamic law, was specifically directed at this situation. Islamic jurisprudence requires that a Muslim ruler govern by Islamic law; a ruler who nominally professes Islam but systematically overrides it with pagan legal custom has not truly embraced the religion.

Ghazan Khan: Background and Character

Ahmad Ghazan ibn Arghun was born in 670 AH (1271 CE) — approximately 14 years after the fall of Baghdad. He was raised in the frontier region of Khorasan, where he served as the viceroy of the eastern provinces from a young age. His early religious identity was Buddhist — he had received Buddhist teachings and reportedly had monks in his court.

The circumstances of his conversion to Sunni Islam are detailed in the sources. The Amir Nawruz, a powerful Mongol commander who had himself recently converted to Islam, was instrumental: when Ghazan needed Nawruz's military support in the succession struggles following his father Arghun's death, Nawruz made his alliance conditional on Ghazan's conversion to Islam.

The initial conversion was therefore at least partly political. But Ghazan's subsequent behavior indicates that his faith became genuine and deep. He studied Islamic theology, ordered the destruction of Buddhist temples throughout his realm, appointed Muslim scholars to positions of influence, enforced Islamic legal standards, and patronized Islamic scholarship on a major scale.

The scholar and statesman Rashid al-Din Fadl Allah, who served as Ghazan's vizier and court historian, provides the most detailed account of Ghazan's policies and his Islamic commitment in the Jami al-Tawarikh (Collection of Chronicles). Rashid al-Din was himself a convert to Islam from Judaism and brought both his organizational genius and his encyclopedic historical curiosity to Ghazan's service.

The Formal Conversion: 694 AH / 1295 CE

The formal conversion took place at the military camp of Shaykh Sadr al-Din Ibrahim ibn Sa'd al-Din Hamawayh — a Sufi shaykh from a distinguished Persian scholarly family. Ghazan publicly declared the shahada in 694 AH (1295 CE), took the Islamic name Mahmud, and required all of his Mongol commanders to either convert to Islam or at minimum discontinue public practice of non-Islamic religions.

Islamic faith is not merely verbal declaration — it requires implementation in life and governance. Ghazan's conversion was accompanied by immediate changes in policy:

Religious policy: Buddhist temples and shrines were destroyed. Christian churches lost the privileged position they had held under the previous Ilkhans. The construction of mosques was encouraged. Scholars and Sufi teachers received patronage.

Legal reform: Ghazan worked to bring Ilkhanate governance closer to Islamic legal norms, though the complete elimination of the Yasa and its replacement with Islamic law was a gradual and incomplete process.

Fiscal reform: He reorganized the tax system, reducing the arbitrary and excessive taxation that had devastated the Muslim agricultural population. Islamic jurisprudence's tax framework (jizya, kharaj, zakat) provided more predictable and just principles than the Mongol system of arbitrary extraction.

Land survey: He created accurate land registries — a practical administrative reform that also reduced the corruption and extortion that had plagued the agricultural economy.

The Battle of Wadi Khaznadar: A Muslim Mongol vs. Mamluks

Ghazan's conversion did not immediately end the conflict between the Ilkhanate and the Mamluk Sultanate — decades of warfare had created entrenched enmities and strategic interests that outlasted the religious shift. In 702 AH (1303 CE), at the Battle of Wadi Khaznadar (also called the Battle of Shaqhab), Ghazan's forces actually defeated the Mamluks and briefly occupied Damascus.

This created a theological paradox: a Muslim scholar like Ibn Taymiyyah, who had issued fatwas declaring jihad against the Mongols (based on their governance by Yasa rather than Islamic law), now faced a situation where the Ilkhan was nominally Muslim. Ibn Taymiyyah's analysis remained that the Mongols had not fully implemented Islamic governance, making resistance still permissible — though the situation was now considerably more complex than it had been when Hulagu's forces were openly pagan.

Ghazan's occupation of Syria was temporary; the Mamluks recovered Damascus after the Mongols withdrew. But the episode illustrates that conversion to Islam, while transformative in terms of religious identity and ultimate loyalties, does not instantly dissolve all political conflicts.

The Cultural Achievement: Rashid al-Din and the Jami al-Tawarikh

One of the most significant achievements of Ghazan's reign was the Jami al-Tawarikh (Collection of Chronicles) of Rashid al-Din Fadl Allah — the first truly universal history, covering not only Islamic dynasties but the Mongols, Chinese, Indians, Franks (Europeans), and Jews. It was written in Persian with illustrated manuscripts — some of the most beautiful Islamic manuscripts ever produced — and represents a high point of Ilkhanate cultural achievement under Islamic patronage.

The Jami al-Tawarikh is an invaluable historical source for the Mongol period. It provides detailed accounts of Genghis Khan, the Mongol campaigns, and the Ilkhanate from sources that would otherwise be inaccessible. The fact that this work was produced under a Muslim Mongol ruler, by a vizier who was himself a convert to Islam, is itself historically significant — the Islamic conversion of the Mongols had produced not merely political change but genuine intellectual and cultural transformation.

The Long-Term Significance: The Islamization of Persia

The conversion of Ghazan Khan completed a process that would make the Ilkhanate successor states among the most Islamic polities on earth. The Ilkhanate fragmented after 736 AH (1335 CE), but the successor states — including the Jalayirids, Muzaffarids, and eventually the Timurids and Safavids — were all Muslim. Iran, which had been Muslim since the Arab conquests of the 7th century CE, had briefly been under pagan/Buddhist Mongol rule; after Ghazan's conversion it was Muslim again and would remain so.

The broader significance extends further. The conversion of the Mongols to Islam in both the Ilkhanate (under Ghazan) and the Golden Horde (under Berke, then Öz Beg) meant that Islam was permanently established across the Eurasian steppe and in the heartland of the old Persian world. The Timurids, who ruled Central Asia and established the Mughal Empire in India, were Turkic-Mongol Muslims. The Ottoman Empire, which conquered Constantinople in 857 AH (1453 CE) and became the dominant Islamic power, arose from a world shaped by the Mongol conversion to Islam.

The theological lesson is one of profound trust in Allah's wisdom. The Mongols had seemed to be the end of Islamic civilization. They destroyed cities, killed scholars, burned libraries. And then, generation by generation, they became Muslims — adding millions of people to the ummah and carrying Islam into regions it might never otherwise have reached.

"They plan, and Allah plans. And Allah is the best of planners" (Surah al-Anfal, 8:30).

Ghazan Khan's Death

Mahmud Ghazan Khan died in 703 AH (1304 CE) at approximately 33 years of age — a brief reign of barely nine years but one that permanently altered the religious character of his empire. He was buried in Tabriz in a magnificent mausoleum that became a monument to the transformation he had wrought.

Ibn Kathir, in al-Bidaya wan-Nihaya, acknowledges Ghazan Khan's conversion and his reforms favorably, noting that his reign represented a genuine improvement in the condition of Muslims under Ilkhanate rule compared to his predecessors. The historian's tone reflects the ambivalence of the period — Ghazan was a Muslim ruler who had also fought against the Mamluks — but the basic acknowledgment of his faith is present.

Sources:

• Rashid al-Din Fadl Allah, Jami al-Tawarikh (Collection of Chronicles, tr. W.M. Thackston)
• Wassaf al-Hazra, Tarikh-i-Wassaf (Persian chronicle of the Ilkhanate)
• Ibn Kathir, al-Bidaya wan-Nihaya, vol. 14
• al-Maqrizi, al-Suluk li-Ma'rifat Duwal al-Muluk
• Reuven Amitai-Preiss, Mongols and Mamluks: The Mamluk-Ilkhanid War 1260-1281
• Peter Jackson, The Mongols and the Islamic World
• Quran 8:30