838 Moslem victory at Dasymon. Amorium captured. Second revolt of Abbas, who dies in prison.
841 Death of Mutasim. His son, Wathik, succeeds. The caliphate begins to decline.
845 Truce with the empress Theodora.
847 Death of Wathik. The state officials elect his son, Muhammed, to succeed, but immediately recall their choice and substitute Wathik’s brother, Mutawakkil. He is noteworthy for his atrocious cruelty, and persecutes the Jews and Christians.
852 Serious revolt in Armenia suppressed in four years.
858 A great war with the Byzantines begins in Asia Minor. The Mohammedans capture the Byzantine commander.
860 Byzantine defeat near Melitene.
861 Murder of Mutawakkil by his Turkish guard, bribed by his son, Muntasir, who takes the caliphate.
862 Death of Muntasir, probably by poison. His cousin, Akhmed, who takes name of Mustain, is chosen to succeed by the Turkish soldiery.
863 Great victory of the Byzantines over the Moslems at Amasia. Death of the general, Omar. Peace for some years results.