The religious policies of Leo III divided the
Chalcedonian Christianity of his time to
Iconoclasts and
Iconodules. With the Emperor leading the former and prosecuting the latter.
Leo III the Isaurian died on 18 June 741. He was succeeded by
Constantine V, his only known son. Constantine was also an Iconoclast and enjoyed support from their faction. On the other hand, Artabasdos gathered support from the Iconodules in preparation for a revolt. In June 741/742, Constantine was crossing
Asia Minor to campaign against the
Umayyad Caliphate under
Hisham ibn Abd al-Malik on the eastern frontier. The forces of Artabasdos attacked his brother-in-law during this course. Defeated, Constantine sought refuge in
Amorion, while the victor advanced on
Constantinople and was accepted as emperor. Artabasdos was crowned Emperor by
Patriarch Anastasius of Constantinople. Anna was declared an
Augusta and their son Nikephoros was raised to co-emperor. Artabasdus declared himself the "Protector of the Holy Icons" and sought to secure himself in the throne. His main support base consisted of the Armeniac, Opsikion and the province of
Thrace. He was recognised as Emperor by Iconodule religious leaders, including
Pope Zachary. The civil war lasted for about two years, ending with the defeat of Artabasdos. The first major battle took place near
Sardis,
Lydia in May 743. An army led by
Niketas, another son of Artabasdos, was defeated in August. Constantine headed for Constantinople and managed to capture the city three months later. Artabasdos was deposed on 2 November 743. ==Retirement==