John Dee

De Heptarchia Mystica, or On the Mystical Rule of the Seven Planets, is a book written in 1582-83 by English alchemist John Dee. It is a guidebook for summoning angels under the guidance of the angel Uriel and contains diagrams and formulae. This book consists of detailed instructions for communicating with angels and employing their aid for practical purposes. Written in the form of a personal Grimoire, or handbook of magic, it consists of excerpts and elaborations from Dee's detailed records of his "mystical exercises" found in Mysteriorum Libri Quinque.

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