Hermeticism or the Western Hermetic Tradition is a set of philosophical and religious beliefs based primarily upon the pseudepigraphical writings attributed to Hermes Trismegistus. These beliefs have heavily influenced the Western esoteric tradition and were considered greatly important during both the Renaissance and the Reformation.

Read more about Hermeticism:  Terminology, Hermeticism As A Religion, Hermetic Beliefs, Hermetic Brotherhoods, Esoteric Christianity