Theophilos was emperor of the Byzantine Empire from 829 to 842 CE. He was the second ruler of the Amorion dynasty founded by his father Michael II. Popular during his reign and responsible for a lavish rebuilding of Constantinople's palaces and fortifications, Theophilos is chiefly remembered today for a major defeat by the Arab Caliphate in 838 CE and as the last emperor who supported the policy of iconoclasm, that is the destruction of icons and their veneration being treated as heresy.

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