The Iconoclasts regained power in 814 after Leo V's accession, and the use of icons was again forbidden at a council in 815. The second Iconoclast period ended with the death of the emperor Theophilus in 842.

How long did iconoclasm last?

However, the Byzantine Iconoclasm refers to two periods in the history of the Byzantine Empire when the use of religious images or icons was opposed by religious and imperial authorities. The “First Iconoclasm,” as it is sometimes called, lasted between about 730 CE and 787 CE, during the Isaurian Dynasty.

What caused the iconoclasm of 726 CE and what was the result?

Iconoclasts' protests of worshiping icons was the cause of the Iconoclastic Controversy in 726 C.E., when emperor Leo III, an iconoclast, ordered all icons in every citizen's home to be destroyed. An opinion that conflicts with official church beliefs. ... The two churches remain separate to this day.