Constantine IV Timeline

Reign of Byzantine emperor Constantine IV.

The Arab Umayyad Caliphate unsuccessfully besieges Constantinople.

First recorded use of Greek Fire in Byzantine warfare during the Arab siege of Constantinople.

The Umayyad Caliphate is obliged by treaty to give up former Byzantine territories in the Aegean.

A Byzantine naval fleet is defeated by the Bulgars.

The Sixth Ecumenical Council in Constantinople declares the end of Monotheletism and Monoenergism.

Byzantine emperor Constantine IV signs a peace treaty with the Bulgars.