This study examines in detail the biographical entry of an Ilkhanid (the Mongol state centred in Iran) princess, El Qutlugh Khatun daughter of Abagha Ilkhan (r. 1265–82), in the biographical dictionaries of the Mamluk author Khalīl ibn Aybeg al-Ṣafadī (d. 1363). Al-Ṣafadī‘s biography of the lady provides a rare glance into the life of women of the Mongol royal household during the transitional period which followed the Ilkhanid conversion to Islam. It sheds light on issues such as the relations between the Mamluks and the Ilkhans in light of the latter's conversion to Islam and the influence of the process of Islamization on traditional Mongolian gender related practices. This paper also discusses the motivation of the Mamluk author in including El Qutlugh's unusual story in his biographical dictionaries showing how his choices might have been influenced not only by his own interests but also by what appealed to his readers.