Al-Wathiq

Abū Jaʿfar Hārūn ibn Muḥammad, better known by his regnal name al-Wāthiq bi’llāh, was an Abbasid caliph who reigned from 842 until 847 AD. The chief events of his reign were the suppression of a Bedouin rebellion in the Hejaz in 845 and an abortive uprising in Baghdad in 846. He also defeated the Hanbali rebel Ahmad Ibn Nasr al-Khuza'i. The conflict with the Byzantine Empire continued, and the Abbasids even scored a significant victory at Mauropotamos, but after a truce in 845, warfare ceased for several years.