Hermes Trismegistus is the central figure of the hermetic tradition of Alchemy. Trismegistus means ‘thrice great’ or ‘thrice hero’. There are many speculations on the significance of his name, but no real conclusions. A reference to a deity going by the name of ‘thrice great’ was found on a clay tablet written in Mycenaean Greek, dating back to between the 16th and 12th centuries BCE.
In Hermeticism, Hermes Trismegistus is regarded as an enlightened being who was reincarnated several times. His earliest incarnation is said to have been a contemporary of biblical Adam. Or in other accounts, Abraham. While he is said to have lived his last incarnation mostly in Egypt during the oldest Egyptian dynasties. That is, centuries before Moses. The authorship of several of the foundational texts of Alchemy is attributed to Hermes Trismegistus. These include the Corpus Hermiticum, the Asclepius and the Emerald Tablet.