Thoth was the builder of the Great Pyramid of Giza, erroneously attributed to Cheops. In it he incorporated his knowledge of the ancient wisdom and also securely secreted records and instruments of ancient Atlantis.
For some 16,000 years, he ruled the ancient race of Egypt, from approximately 52,000 B.C. to 36,000 B.C. At that time, the ancient barbarous race among which he and his followers had settled had been raised to a high degree of civilization.
Thoth was an immortal, that is, he had conquered death, passing only when he willed and even then not through death. His vast wisdom made him ruler over the various Atlantean colonies, including the ones in South and Central America.
When the time came for him to leave Egypt, he erected the Great Pyramid over the entrance to the Great Halls of Amenti, placed in it his records, and appointed guards for his secrets from among the highest of his people.
In later times, the descendants of these guards became the pyramid priests, by which Thoth was deified as the God of Wisdom, The Recorder, by those in the age of darkness which followed his passing. In legend, the Halls of Amenti became the underworld, the Halls of the gods, where the soul passed after death for judgment.
During later ages, the ego of Thoth passed into the bodies of men in the manner described in the tablets. As such, he incarnated three times, in his last being known as Hermes, the thrice-born.
In this incarnation, he left the writings known to modern occultists as the Emerald tablets of Thoth, a later and far lesser exposition of the ancient mysteries.