On this day in 775 Constantine V, Byzantine emperor (b. 718) died.
Constantine was born in Constantinople, the son and successor of Emperor Leo III and Maria. In August 720 he was associated on the throne by his father, who had him marry Tzitzak, daughter of the Khazar khagan Bihar. His new bride was baptized as Irene in 732. Constantine V succeeded his father as sole emperor on 18 June 741.