The Corpus Hermeticum are the core documents of the Hermetic
tradition. Dating from early in the Christian era, they were
mistakenly dated to a much earlier period by Church officials (and
everyone else) up until the 15th century. Because of this, they were
allowed to survive and were seen as an early precursor to what was to
be Christianity. We know today that they were, in fact, from the
early Christian era, and came out of the turbulent religious seas of
Hellenic Egypt.
These are all taken from Mead's translations, which are in the
public domain at this point.