assassinated in his bath at Syracuse, [234].
Constantine and Charlemagne, their work on the Church compared, [516].
Constantine III., poisoned by the empress Martina, [159].
Constantine IV., Pogonatus, [236];
solicits union with the Pope, [238];
addresses the Pope at the Sixth Council as the living Peter, [249];
his position as emperor, [261];
reigns from 668 to 685, a great contrast to his father, Constans II., [262].
Constantine V., Kopronymus, emperor, leaves Pope Stephen II. undefended at the Lombard invasion, [354];
Pope Stephen II. ceases to recognise his sovereignty over Rome, [357];