Francis Barrett (born probably in London around 1770–1780) was an English occultist. Barrett, an Englishman, claimed himself to be a student of chemistry, metaphysics and natural occult philosophy. He was known to be an extreme eccentric who gave lessons in the magical arts in his apartment and fastidiously translated Kabbalistic and other ancient texts into English. According to his biographer Francis X. King, Barrett's parents were humble folk married in the parish of St. Martin's in the Fields on September 29, 1772. Wikipedia, Francis Barrett
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