Constantine V (Greek: Κωνσταντινος Ε΄)was Roman Emperor and Caliph of Islam from 741 to 775. The son and successor of Leo III, his early reign was marked by civil disturbance as he struggled with the powerful general Artabasdos of Armenia for power. By 745 however his position had been secured and Artabasdos blinded. Constantine died in 775. He was succeeded as sole emperor by his son Leo IV.