Hermes Trismegistus

"Thrice-greatest Hermes": the Greek god of speech and boundaries folded onto the Egyptian Thoth, god of writing, measure and the judgment of the dead, and then treated by Greek-speaking Egyptians as a very ancient sage who had written the books. He is a name a literature was filed under, the way "Solomon" and "Enoch" are.

The whole tradition hangs from a pseudonym — and for fourteen hundred years the pseudonym was the credential. Everything this pack has to say about provenance starts by admitting that.