Constantine IV Pogonatus, 15 July 668 - 10 July 685 A.D.
Joint rule with Constans II (his father), 13 April 654 - 15 July 668 A.D., and Heraclius and Tiberius (his brothers), 2 June 659 - autumn 681 A.D.Constantine IV Pogonatus should be credited with saving Europe from Muslim conquest. Beginning in 674, the great siege of Constantinople, by the caliph Muawiyah I, lasted four years. The newly invented famous "Greek Fire" made the city impregnable and the Arabs were forced to retreat. In 681 he deposed his two brothers. He was succeeded by his 16 year old son Justinian II.
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