Feast of Orthodoxy
The Feast of Orthodoxy (or Sunday of Orthodoxy or Triumph of Orthodoxy) is celebrated on the first Sunday of Great Lent in the Eastern Orthodox Church and other churches using the Byzantine Rite to commemorate, originally, only the final defeat of iconoclasm on the first Sunday of Lent in 843, and later also opposition to all heterodoxy. == History == Despite the teaching about icons defined at the Seventh Ecumenical Council in 787, the iconoclasts began to trouble the Church again.