Heraclius (, Herakleios) was the brother of the Byzantine emperor Tiberius III (r. 698–705) and the Byzantine Empire's leading general during his reign. He scored a number of victories against the Umayyads, but was unable to halt the Arab conquest of Armenia, nor able to prevent the deposition of his brother by Justinian II (r. 685–695 and 705–711), who later captured and executed them both.