Saint Theodore Studites

St. Theodore of Studium - - Biography of this monk, priest, and abbot. He was a champion of the independence of the Church, and of the veneration of icons. St. Theodore died in 826. From the Catholic Encyclopedia.

Theodore of Studium, Saint - - Brief biographical entry in the Columbia Encyclopedia.

Wikipedia: Theodore the Studite - - Life and accomplishments. Includes eleventh century mosaic of the saint.