The Keys to the Gateway of Magic by Dr Stephen SkinnerSummoning the Solomonic Archangels and Demon Princes This classic text of the Nine Great Keys details the invocation of the Archangels, the full hierarchy of spiritual beings (including Olympic Spirits and Elementals) and the evocation of the four Demon Princes. Highly sought after, this edition of a rare early seventeenth century grimioire has never before appeared in English. Occult scholar Stephen Skinner, along with magician and author David