Theodoros of Tabenna was a 4th-century Egyptian monk and abbot who served as the spiritual successor to Pachomius. Born into a wealthy family in the region of Esna, he joined a monastery at the age of fourteen. He eventually became a central figure in the Pachomian Koinonia, the first major federation of cenobitic monasteries. After the death of Pachomius, Theodoros played a vital role in stabilizing the monastic community and preventing its collapse during a period of leadership instability.