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When did Leo III make Iconoclasm the official policy of the Byzantine Empire?
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Leo III
Leo III, gold solidus from Constantinople, 717–741.
Byzantine Emperor Leo III made Iconoclasm the official policy of the Byzantine Empire in 730.123
While Leo III began speaking out publicly against the use of religious images in 726, it was not until his formal decrees in 730 that the practice was officially prohibited and the destruction of sacred images in churches was mandated.123