Epp. iii., ccxxiii.  The researches of Prof. W. M. Ramsay enable the exact spot to be identified with approximate certainty, and, with his guidance, a pilgrim to the scenes of Basil’s boyhood and earlier monastic labours might feel himself on fairly sure ground.  He refers to the description of St. Basil’s hermitage given by Gregory of Nazianzus in his Ep. iv., a description which may be compared with that of Basil himself in Ep. xiv., as one which “can hardly refer to any other spot than the rocky glen below Turkhal.  Ibora,” in which the diocese Annesi was situated, “cannot be placed further down, because it is the frontier bishopric of Pontus towards Sebasteia, and further up there is no rocky glen until the territory of Comana is reached.  Gregory Nyssenus, in his treatise on baptism” (Migne, iii. 324 c.) “speaks of Comana as a neighbouring city.  Tillemont, thinking that the treatise was written at Nyssa, infers that Nyssa and Comana were near each other.  The truth is that Gregory must have written his treatise at Annesi.  We may therefore infer that the territory of Ibora adjoined that of Comana on the east and that of Sebasteia on the south, and touched the Iris from the boundary of Comana down to the point below Turkhal.  The boundary was probably near Tokat, and Ibora itself may have been actually situated near Turkhal.”  Prof. W. M. Ramsay, Hist. Geog. of Asia Minor, p. 326.