The Second Iconoclast Schism - 814 and 842.
BYZANTINE ICONOCLASM SCHISM:
it is VERY important in this study to isolate all the religious figures and political figures who were against images. These men were being used by God (one way or another) to try to clean idolatry out of Orthodoxy in a first step to reform it into true Christianity, tho there would be a LONG way to go with a religion so saturated with the sacerdotalist heresy, or Nicolaitan Heresy (power over the laity).
in progress......
Justinian II put Christ on the obverse of coins, but apparently his Quinisext Council said this represented only his humanity, it was not to be seen like a theophany. This helped use of icons to grow more common, and may have later triggered the schism, according to this video....
The Byzantine Iconoclasm Schism 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 within the Eastern Church and the temporal imperial hierarchy.
The "First Iconoclasm", as it is sometimes called, lasted between about 726 and 787.
The "Second Iconoclasm" was between 814 and 842. According to the traditional view, Byzantine Iconoclasm was started by a ban on religious images by Emperor Leo III and continued under his successors. It was accompanied by widespread destruction of images and persecution of supporters of the veneration of images.