repelled an attack by the Abbasids against Asia Minor. Death and succession Leo died of a violent fever, due to his tuberculosis, on 8 September 780. Constantine, still only nine years old, became the new emperor, with Irene as his regent. References Citations Bibliography 8th-century Byzantine emperors Isaurian dynasty 750 births 780 deaths Byzantine people of the Arab–Byzantine wars Khazar people 770s in the Byzantine Empire Irene of Athens 8th-century deaths from tuberculosis Tuberculosis deaths in the Byzantine Empire Sons of Byzantine emperors