The Council of Constantinople of 815 was held in the Byzantine capital, in the Hagia Sophia (Αγία Σοφία), the Orthodox Patriarchal Cathedral. (The name means Holy Wisdom.) This council was called by Leo V, an iconoclast, and initiated the second period of the Byzantine Iconoclasm.

Shortly before it convened, the iconophile, one who supports the use of icons, Patriarch Nikephoros I was deposed by Emperor Leo V the Armenian in favor of the iconoclast Theodotos I. Theodotos presided over the council, which reinstated iconoclasm, repudiating the Second Council of Nicaea Also called the Seventh Ecumenical Council) and reaffirming the decisions of the Council of Hieria of 754. Although the meeting had been convened at the behest of the iconoclast Emperor, much of the Iconoclast effort was driven by other clerics, including the later patriarchs Antony I and John VII. In the aftermath of this synod Theodotos is supposed to have tortured by starvation more than one iconophile abbot in an attempt to force them into agreement. 2/18/19