The state founded by Genghis Khan's grandson Hülegü after he conquered Persia and the Middle East. Ilkhan means subordinate khan, a title that acknowledged the Great Khan above. Once the empire split over who that Great Khan was, however, the Ilkhanate acted as an independent state in all but name.
Hülegü's army swept through the Islamic world and took Baghdad, capital of the Abbasid caliphate. In the generations that followed, the Mongols there gradually took up Persian culture and Islam.
The capital, Tabriz, was a market where merchants from Europe and India met, and a great observatory at Maragha recorded the movements of the stars. The vizier Rashid al-Din compiled the Jami' al-tawarikh, a history that gathered the Mongols, China, India and Europe into one book — a remarkably early attempt to tell the story of many peoples together.
To the north it clashed with the Golden Horde over Caucasus pasture, to the east with the Chagatai Khanate over Khorasan, and to the west it fought the Mamluks of Egypt for decades. Envoys went several times to the pope and the kings of Europe proposing a joint attack on the Mamluks, but the two sides never managed to act together.
When Ghazan Khan accepted Islam in 1295, the Ilkhanate became far more a Persian state. Taxes were reformed and mosques and schools were built, but when Abu Sa'id died without an heir in 1335 the realm broke into pieces.
Hülegü is said to have been buried on Shahi Island in Lake Urmia. Stories long claimed that great treasure was placed in the tomb and the site hidden from everyone, and to this day no grave has been found.
Ilkhan of the Ilkhanate
Mongol prince proclaimed Great Khan at Karakorum
Khan of the Chagatai Khanate
Khan of the Golden Horde
Founder of the Ilkhanate and commander of the western campaign
Leader of the House of Ögedei
Fifth Great Khan of the Mongol Empire and founder of the Yuan dynasty