Hermes Trismegistus, a legendary Hellenistic figure combining the Greek deity Hermes with the Egyptian god Thoth, is traditionally regarded as the author of the Hermetica, a collection of writings that form the basis of Hermeticism. This tradition, merging empirical and spiritual insights, had a profound impact on alchemy, astrology, and mystical philosophy. Scholars such as W.H. Davenport Adams connected him to Egyptian roots, portraying his knowledge as a link between ancient science and the divine, while Samuel Butler criticized contemporary Hermeticists as misguided adherents.
Geoffrey Chaucer observed his connection to alchemical literature, and John Uri Lloyd praised the enduring validity of the Hermetic Art. Lactantius, on the other hand, highlighted his role in theology, underscoring the oneness of God. The Hermetica, although credited to Hermes, were probably written by later Greek thinkers, embodying a synthesis of Platonism, Stoicism, and esoteric teachings that influenced both Renaissance thought and Islamic alchemical traditions.