MICHAEL I., RHANGABE, Emperor of Constantinople, was the son of Theophylactus, and grandson of Rhangabe, from whom he derived his surname. The Emperor Nicephorus honoured him with the hand of his daughter Procopia, and the office of master of the palace; but after the battle with the Bulgarians, in which that monarch was slain, and his son Stauracius was mortally wounded, the latter, while sensible that he could not long retain the purple, was opposed to Michael as his successor. Michael, however, was in 811 named emperor even before the death of Stauracius, and made an ineffectual attempt against his life; but he was unable to retain the throne against the opposition of the army, although the people were well disposed towards him. He retired to a convent after a reign of two years, and died in the year 815.