(Greek:
eikon, image, and klaein, to break)
A heresy that disturbed the peace of the Eastern Church in the 8th and 9th
centuries. It rejected both the use and the veneration of images. The first
storm against images was raised by an Emperor, Leo the Isaurian, 726, and
brought to an end by the Seventh General Council, 787, under the protection
of the Empress Irene; the second, inaugurated by Emperor Leo V, was ended by
the establishment of the feast of Orthodoxy (19 February 842), under the
Empress Theodora. In the West there was an echo of the controversy under
Charlemagne, 790. Here the controversy turned about the veneration of
images. In an interchange of letters between the pope and the Frankish
bishops the principles were gradually clarified and the decrees of the
Seventh General Council accepted.
New Catholic Dictionary