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  • Giovanni Mercurio da Correggio (1451 - 1505)
    Giovanni Mercurio da Correggio (Latin name: Iohannes Mercurius de Corigio ; 1451 - ?) was an Italian itinerant preacher, Hermeticist, and alchemist. Due to his bizarre appearance in Rome on Palm Su...
  • Lodovico Lazzarelli (1447 - 1500)
    Ludovico Lazzarelli (4 February 1447 – 23 June 1500) was an Italian poet, philosopher, courtier, hermeticist and (likely) magician and diviner of the early Renaissance. Born at San Severino Marche, ...
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  • Giuseppe Francesco Borri (1627 - 1695)
    Giuseppe Francesco Borri (4 May 1627, in Milan – 20 August 1695, in Rome) was an alchemist, prophet, freethinker, physician and eye doctor.
  • Franz Mesmer (1734 - 1815)
    Franz Anton Mesmer (May 23, 1734 – March 5, 1815) was a German physician with an interest in astronomy, who theorised that there was a natural energetic transference that occurred between all animated ...

The occult (from the Latin word occultus "clandestine, hidden, secret") is "knowledge of the hidden". In common English usage, occult refers to "knowledge of the paranormal", as opposed to "knowledge of the measurable", usually referred to as science. The term is sometimes taken to mean knowledge that "is meant only for certain people" or that "must be kept hidden", but for most practicing occultists it is simply the study of a deeper spiritual reality that extends beyond pure reason and the physical sciences. The terms esoteric and arcane have very similar meanings, and in most contexts the three terms are interchangeable.

It also describes a number of magical organizations or orders, the teachings and practices taught by them, and to a large body of current and historical literature and spiritual philosophy related to this subject.