Феодор Студит
Of all the monasteries of this period the most celebrated was that of St. John the Baptist of Studium, founded at Constantinople in the fifth century. It acquired its fame in the time of the iconoclastic persecution while it was under the government of the saintly Hegumenos (abbot) Theodore, called the Studite. In 781, Platon, a monk in the Symbola Monastery in Bithynia, and the uncle of Theodore the Studite, converted the family estate into the Sakkudion Monastery. Platon served as abbot, with Theodore as his assistant. In 794, Theodore was ordained by Tarasios of Constantinople and became abbot. Around 797 Empress Irene made Theodore leader of the ancient Stoudios Monastery in Constantinople. He set himself to reform his monastery and restore St. Basil's spirit in its primitive vigour. But to effect this, and to give permanence to the reformation, he saw that there was need of a more practical code of laws to regulate the details of the daily life, as a supplement to St Basil's Rules. He therefore drew up constitutions, afterwards codified, which became the norm of the life at the Studium monastery, and gradually spread thence to the monasteries of the rest of the Greek empire. Thus to this day the Rules of Basil and the Constitutions of Theodore the Studite, along with the canons of the Councils, constitute the chief part of Greek and Russian monastic law.