Constantine V was a Byzantine Emperor who ruled from 741 to 775 AD. He was known for his military campaigns against the Arabs and for his efforts to strengthen the Byzantine Empire. His reign was marked by significant administrative reforms and the promotion of iconoclasm, which opposed the veneration of religious images. During his rule, Constantine V faced internal challenges, including opposition from the Church and various factions within the empire. He was a controversial figure, often remembered for his harsh treatment of iconodules, those who supported the use of icons in worship. His legacy is a complex mix of military success and religious conflict.