Wikipedia
Al-Mu'tamid
Al-Mu'tamid (المعتمد al-Muʿtamid) (844 – 15 October 892) was the Abbasid Caliph in Baghdad from 870 to 892 and eldest surviving son of al-Mutawakkil. He held the title of caliph for 23 years, though he was a largely a ruler in name only.