The fifteen tractates of the Corpus Hermeticum, along with the Perfect Sermon or Asclepius, are the foundation documents of the Hermetic tradition. Written by unknown authors in Egypt sometime before the end of the third century C.E., they were part of a once substantial literature attributed to the mythic figure of Hermes Trismegistus, a Hellenistic fusion of the Greek god Hermes and the Egyptian god Thoth.
This literature came out of the same religious and philosophical ferment that produced Neoplatonism, Christianity, and the diverse collection of teachings usually lumped together under the label “Gnosticism”: a ferment which had its roots in the impact of Platonic thought on the older traditions of the Hellenized East. There are obvious connections and common themes linking each of these traditions, although each had its own answer to the major questions of the time.
The treatises we now call the Corpus Hermeticum were collected into a single volume in Byzantine times, and a copy of this volume survived to come into the hands of Lorenzo de Medici's agents in the fifteenth century. Marsilio Ficino, the head of the Florentine Academy, was pulled off the task of translating the dialogues of Plato in order to put the Corpus Hermeticum into Latin first. His translation saw print in 1463, and was reprinted at least twenty-two times over the next century and a half.
–John Michael Greer
The Hermetic tradition represents a non-Christian lineage of Hellenistic Gnosticism. The tradition and its writings date to at least the first century B.C.E., and the texts we possess were all written prior to the second century C.E. The surviving writings of the tradition, known as the Corpus Hermeticum (the “Hermetic body of writings”) were lost to the Latin West after classical times, but survived in eastern Byzantine libraries. Their rediscovery and translation into Latin during the late-fifteenth century by the Italian Renaissance court of Cosimo de Medici, provided a seminal force in the development of Renaissance thought and culture. These eighteen tracts of the Corpus Hermeticum, along with the Perfect Sermon (also called the Asclepius), are the foundational documents of the Hermetic tradition.
–Gnostic Society Archive