Al-Adil Sayf ad-Din Tuman Bay () was the twenty fifth Mamluk Sultan of Egypt from the Burji dynasty. He ruled for about one hundred days in 1501.
Tuman Bay I was about forty years old when he was selected as Sultan.شفيق مهدى ( دكتور) : مماليك مصر و الشام, الدار العربية للموسوعات, بيروت 2008 Although he was popular before becoming a Sultan, he soon lost that popularity due to his cruel measures, which was manifested in condemning one of the princes to death by hanging for alleged conspiracy.
He was overthrown and succeeded by Al-Ashraf Qansuh al-Ghawri.
He was married to the Mamluk noblewoman Fāṭima bint ʿAlī ibn Khaṣṣbak (d. 1505), the rich widow of sultan Qaitbay (r. 1468-1497) and sister of Zaynab bint ʿAlī ibn Khaṣṣbakd, who was the widow of Sultan Sayf al-Din Inal (r. 1453-1461).Albrecht Fuess, “How to marry right: Searching for a royal spouse at the Mamluk court of Cairo in the fifteenth century”, DYNTRAN Working Papers, n° 21, online edition, February 2017, available at: http://dyntran.hypotheses.org/1761
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