Guido Bonatti, Italian Astronomer and Astrologer

Guido Bonatti (died between 1296 and 1300) was an Italian mathematician, astronomer and the most celebrated astrologer of the 13th century. Bonatti was advisor of Frederick II, Holy Roman Emperor, Ezzelino da Romano III, Guido Novello da Polenta and Guido I da Montefeltro. He also served the communal governments of Florence, Siena and Forlanot. His employers were all Ghibellines (supporters of the Holy Roman Emperor), who were in conflict with the Guelphs (supporters of the Pope). His astrological reputation was also criticized in Dante's Divine Comedy, where he is depicted as residing in hell as punishment for his astrology. His most famous work was his Liber Astronomiae or Book of Astronomy, written around 1277. This remained a classic astrology textbook for two centuries

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