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The Jāmiʿ al-Tawārīkh is the most important single source for the history of the Ilkhanate period and the Mongol Empire. It was written by Rashid al-Din, a Persian historian who served the Ilkhanate court. The Jāmiʿ al-Tawārīkh is a vast and comprehensive work, covering the history of the world from the creation of the universe to the reign of the Ilkhanate ruler Ghazan Khan.