For more than a century the Church was torn by iconoclasm, the teaching that holy images must be destroyed. The Seventh Ecumenical Council, in 787, upheld the icons and taught that the honour given to an icon passes to the one it shows. Iconoclasm returned, and ended only in 843.
That year, after the death of the last iconoclast emperor, his young son Michael III, his mother the regent Theodora, and Patriarch Methodios called a synod in Constantinople. On the first Sunday of Lent the faithful carried the icons in procession from the Church of Blachernae to Hagia Sophia, and set them back in their place.
The Church has kept that Sunday ever since. After the Liturgy, especially in cathedrals and monasteries, the clergy and people process with icons, and the Synodikon of Orthodoxy, the synod's decree, is read.
