iconoclast: [17] The original iconoclasts were members of the Eastern Orthodox church in the 8th and 9th centuries AD who were opposed to the use or worship of religious images. In more extreme cases their opposition took the form of smashing icons (the word iconoclast comes via medieval Latin from medieval Greek eikonoklástēs, a compound formed from eikón ‘icon’ and the verb klan ‘break’).
The term subsequently came to be applied to extreme Protestants in England in the 16th and 17th centuries who expressed their disapproval of graven images (and popish practices in general) in similar ways. Its general use for an ‘attacker of orthodoxy’ dates from the early 19th century. [iconoclast etymology, iconoclast origin, 英语词源]