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Constantine IV

Constantine IV

652 CE685 CE · Constantinople

Constantine IV was Byzantine emperor from 668 to 685, whose reign marked a turning point in the empire's struggle for survival against the Arab caliphate. He successfully withstood the first sustained Arab siege of Constantinople between roughly 674 and 678, a defense in which the incendiary weapon known as Greek fire played a decisive part, compelling the Umayyads to agree to a truce. In 680–681 he convened the Sixth Ecumenical Council at Constantinople, which condemned Monothelitism and restored doctrinal accord with Rome. He also confronted the arrival of the Bulgars south of the Danube, effectively recognizing the new Bulgar state.

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Constantinople

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In Constantinople at the same time

Constans II, Leo III the Isaurian

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