Abu'l-Abbas Ahmad ibn Talha al-Muwaffaq (857 – 5 April 902), better known by his regnal name al-Mu'tadid bi-Allah (, "Seeking Support in God") was the Abbasid Caliph in Baghdad from 892 until his death in 902. Prior to that, he had succeeded his father, al-Muwaffaq, as regent of the Caliphate under his uncle Caliph al-Mu'tamid in 891. Like his father, al-Mu'tadid's power depended on his close relations with the army, which he led in person in several campaigns, beginning with the suppression of the Zanj Rebellion. Al-Mu'tadid distinguished himself for his energy and ability, and succeeded in restoring to the Abbasid state some of the power and provinces it had lost during the turmoil of the previous decades, but his reign was too short to effect a lasting reversal of the Caliphate's fortun