Venerable Theodore the Studite

Theodore the Studite was a Byzantine abbot, monastic reformer, and theologian who became one of the foremost defenders of the holy icons during the second period of iconoclasm. Born about 759 in Constantinople to the imperial official Photinus and his wife Theoctiste, he received a thorough education in rhetoric, philosophy, and theology before withdrawing, together with his family, to the monastic life under his uncle, the abbot Plato. He is commemorated on November 11.

Theodore's career as abbot of the Studion monastery in Constantinople transformed it into the leading center of organized cenobitic monasticism in the Byzantine world. He restored and greatly enlarged the community, which under his guidance grew to around a thousand monks, and he composed a detailed rule of common life, known as the Studite Rule, that ordered the monastery's worship, labor, and discipline. This rule subsequently became a model for monasteries across the Orthodox East, including the foundations of Mount Athos.

He is best remembered as a confessor who repeatedly suffered exile and persecution. He opposed imperial interference in the canonical order of the Church under several emperors, and during the renewed iconoclasm of Leo V he publicly defended the veneration of icons, for which he was exiled and imprisoned more than once. He wrote extensively in their defense, most notably the treatise On the Holy Icons, along with numerous letters, catechetical instructions, and hymns. He died in 826.