Council of Constantinople (843)
The Council of Constantinople of 843 or the Synod of Constantinople of 843 was a local council (as opposed to an ecumenical council) of Christian bishops that was convened in Constantinople (modern-day Istanbul, Turkey) in AD 843 by the Byzantine regent Theodora. This council, convened to refute iconoclasm, is still celebrated on the first Sunday of Great Lent in the Eastern Orthodox Church, as decreed by the council. Attendees under the presidency of Patriarch Methodios I met on 11 March 843 and symbolically processed from the Church Blachernae to the Church of Hagia Sophia bearing an icon of the Mother of God.