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668 - 685Reign of Byzantine emperor Constantine IV.
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674 - 678The Arab Umayyad Caliphate unsuccessfully besieges Constantinople.
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678First recorded use of Greek Fire in Byzantine warfare during the Arab siege of Constantinople.
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679The Umayyad Caliphate is obliged by treaty to give up former Byzantine territories in the Aegean.
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680A Byzantine naval fleet is defeated by the Bulgars.
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680 - 681The Sixth Ecumenical Council in Constantinople declares the end of Monotheletism and Monoenergism.
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681Byzantine emperor Constantine IV signs a peace treaty with the Bulgars.
