“Black books,” as they were often called, came into usage around the 13th century. They were possessed not only by magicians and sorcerers but also by physicians and noblemen - or anyone who thought he had something to gain with a little help from a demon. Ideally, the grimoire was copied by hand.
Hermes Trismegistus (a mythological blend of the Egyptian god Thoth and the Greek god Hermes) was portrayed in art as holding an emerald upon which was inscribed the whole of the Egyptians’ philosophy.
A bronze tablet measuring 50 by 30 inches, decorated with silver and enamel inlay and covered with hieroglyphics and inscriptions concerning mystical knowledge and an occult system of sacrifices, rites and ceremonies.