16th Caliph of Cairo
Al-Mustamsik (Arabic: أبو الصبر يعقوب المستمسك بالله, Abū ṣ-Ṣabr Yaʿqūb al-Mustamsik bi-Llāh; died 1521) was the sixteenth and penultimate Abbasid caliph of Cairo under the tutelage of the Mamluk Sultanate. He served as caliph twice, his first term from 1497 to 1508 and his second term from 1516 to 1517, when he abdicated the position to his son, al-Mutawakkil III.
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