Al-Musta'sim was the last Abbasid Caliph in Baghdad who ruled from 1242 to 1258. In 1258 Baghdad was invaded by Mongols. Al-Musta'sim was executed by Hulagu Khan, the grandson of Genghis Khan. The Mamluk sultans and Syria later appointed an Abbasid Caliph in Cairo, but they were even more symbolic than by now marginalized Abbasid Caliphs in Baghdad. They were ignored by the rest of the Muslim world. Even though they kept the title for about 250 years more, other than installing the Sultan in ceremonies, these Caliphs had no importance.

After the Ottomans conquered Egypt in 1517, the remaining Caliph was transported to Constantinople, and Sultan Selim I announced himself to be a Caliph.

Preceded by: al-Mustansir	Abbasid Leader	Succeeded by: al-Mustansir , Abbasid Caliphs in Cairo
	Caliph