Ata-Malik Juvayni
Volumes I and II of the "Jāmiʿ al-Tawārīkh" have survived and are of great importance for the study of the Ilkhanate. Volume I is "contains the history of the Turkish and Mongol tribes, including their tribal legends, genealogies, myths and the history of the Mongol conquests from the time of Genghis Khan to the end of the reign of Ghazan Khan" while volume II describes "the history of all the peoples with whom the Mongols had fought or with whom they had exchanged embassies". In his narration down to the reign of Möngke Khan (1251–1259), Ata-Malik Juvayni was Rashid al-Din's main source; however, he also utilized numerous now-lost Far Eastern and other sources. The "Jāmiʿ al-Tawārīkh" is perhaps the single most comprehensive Persian source on the Mongol period. For the period of Genghis Khan, his sources included the now lost "Altan Debter" ("Golden Book"). His treatment of the Ilkhanid period seems to be biased, as he himself was a high official, yet it is still seen as the most valuable written source for the dynasty.