The monastery was given the name St Simeon by archaeologists and travelers, but earlier Arabic and Coptic sources called it Anba Hatre (Hidra, Hadri, Hadra), after an anchorite who was consecrated a bishop of Syene (now Aswan) by Patriarch Theophilus (385-412 AD).
Anba Hatre married at the age of eighteen. Tradition says that just after the wedding, he encountered a funeral procession which inspired him to preserve his chastity and later become a disciple of Saint Baiman.
After eight years of ascetic practices under the supervision of his teacher, he retired to the desert and applied himself to the study of the life of Saint Antony. He died during the time of Theodosius I.