The Sunday of Orthodoxy was established in order for the Church to celebrate the restoration of the Icons and the victory of true religion over the Iconoclasts. The Iconoclasts were the modernists of that time, who began with the abolition of iconography, so that they might proceed gradually, as all such people are wont to do, to other destructive reforms, the end result being to leave nothing in Orthodoxy intact. The Icon was the symbol of Orthodoxy, and Byzantium was in turmoil over the Icons, in civil war, for 116 years. In 787 A.D., the Seventh Ecumenical Synod took place in Nicaea. This Synod proclaimed the restoration of the Icons, and put an end to the Iconoclasm which had started in 726, in the reign of Leo the Isaurian. But even after the Seventh Ecumenical Synod, Iconoclasm was revived, and so another Synod took place in Constantinople in 842, and this Synod confirmed the Seventh Ecumenical Synod. Thus did that madness of Iconoclasm cease.



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