This is the sudden disappearance of Gregory from Nazianzus at the end of 375, which was due at once to his craving for retirement and his anxiety not to complicate the appointment of a successor to his father (who died early in 374) in the see of Nazianzus.  He found a refuge in the monastery of Thecla at the Isaurian Seleucia.  (Carm. xi. 549.)