Hermes Trismegistus ('Thrice-Greatest Hermes') is a legendary syncretic figure combining the Greek god Hermes and the Egyptian god Thoth, venerated as the purported author of the Corpus Hermeticum and related texts. These writings, composed largely in the 2nd–3rd centuries CE, present a mystical cosmology blending Platonism, Stoicism, and Egyptian religious thought. Though not a historical person, the figure was treated as a primordial sage and prophet by late antique, medieval, and Renaissance thinkers.
Attributed authorship of the Corpus Hermeticum, the foundational texts of the Hermetic tradition
Synthesis of Greek philosophical concepts (especially Platonist and Stoic) with Egyptian theological thought
Formulation of the principle 'As above, so below,' central to Hermetic cosmology
Profound influence on Renaissance Neoplatonism and Western esoteric traditions via Ficino's Latin translation (1463)
Association with the origins of alchemy, astrology, and theurgy in the Western tradition