What was the Byzantine iconoclast controversy of the 8th and 9th centuries about?

The Byzantine iconoclast controversy was a significant theological and political conflict in the 8th and 9th centuries regarding the use of religious images, or icons, in Christianity. Iconoclasts opposed the veneration of icons, viewing it as idolatrous, while iconodules supported their use as legitimate expressions of faith. This dispute led to periods of violent conflict, ecclesiastical rulings, and changes in imperial policy, reflecting broader tensions between religious authority and imperial power. The controversy ultimately ended with the restoration of icon veneration in 843, marking a significant moment in Byzantine religious history.