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Izz al-Din Jafar was Sultan of the Eretnids from 1354 to 1355. Although his younger brother Ghiyath al-Din Muhammad I was favored and allowed to rise to the throne by the Eretnid emirs, his incompetence in governance led Izz al-Din Jafar to become the sultan a short while after. The next year, Muhammad restored his rule and drove Jafar away.
Uzunçarşılı, İsmail Hakkı (20 April 1968). "Sivas - Kayseri ve Dolaylarında Eretna Devleti" [State of Eretna in Sivas - Kayseri and Around]. BELLETEN (in Turkish). 32 (126). Turkish Historical Association: 161–190. Retrieved 28 October 2023.