On the First Sunday of Great Lent—the "Sunday of Orthodoxy"—the church celebrates the Rite of Orthodoxy, at which anathemas are pronounced against numerous heresies. This rite commemorates the end of Byzantine Iconoclasm—the last great heresy to trouble the church (all subsequent heresies—so far—merely being restatements in one form or another of previous errors)—at the Council of Constantinople in 843. The "Synodicon", or decree, of the council was publicly proclaimed on this day, including an anathema against not only Iconoclasm but also of previous heresies. The "Synodicon" continues to be proclaimed annually, together with additional prayers and petitions in cathedrals and major monasteries throughout the Eastern Orthodox Churches. During the rite (which is also known as the "Triumph of Orthodoxy"), lections are read from Romans 16:17–20, which directs the church to "...mark them which cause divisions and offenses contrary to the doctrine you have learned, and avoid them. For they … by good words and fair speeches deceive the hearts of the simple," and Matthew 18:10–18, which recounts the parable of the Good Shepherd, and provides the procedure to follow in dealing with those who err: