Trismegistus ( Greek : Ἑρμῆς ὁ Τρισμέγιστος , "thrice-great Hermes"; Latin : Mercurius ter Maximus ) is the representation of the syncretic combination of the Greek god Hermes and the Egyptian god Thoth . [1] In Hellenistic Egypt, the Greeks recognised the congruence of their god Hermes with the Egyptian god