The new Greek letters Mercurius [Hermes] is considered for taken to Egypt, and out of Egypt Cadmus took these to Greece Pseudo-Hyginus, Fabulae 277 (trans. Grant) (Roman mythographer C2nd A good.D.) : “First Creators . . . Cadmus [not Kadmos but Euandros, child out of Hermes and you can Karmentis]...