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Twelve Keys of Basil Valentine

The 'twelve keys' is a famous work by the Basil Valentine, supposed to have been a Bendictine Monk-Adept of the 15th century. The Basil Valentine writings, however, emerge in the last decade of the 16th century. The text of the 'twelve keys' was initially published in 1599 without illustrations, though the following edition of 1602 had rough woodcuts. The famous series of engravings were first included in the Michael Maier's Tripus aureus of 1618, issued by Lucas Jennis.

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