Феодор Студит
The Monastery of Stoudios was considered the most important monastery in Byzantine Constantinople. As head abbot, or Hegumen, Sabas was the immediate predecessor to Theodore the Studite. Other notable Stoudios abbots included Symeon the Studite and Niketas Stethatos. It is unknown if Sabas was still alive when Theodore became abbot, and what he might have done after leaving Stoudios.