Hermes Trismegistus, or thrice-greatest Hermes, may have been the author of a number of Alchemical texts. Some speculate that he was a mythical creation from a combination of the Greek god Hermes and the Egyptian god Thoth. The writings attributed to Hermes had a decisive effect on the Renaissance. Perhaps the most famous work attributed to Hermes is "The Emerald Tablet" that includes the passage: That that which is Above is like that which is Below...