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| Guido Bonatti | |
|---|---|
| Name | Guido Bonatti |
| Birth date | c. 12th century |
| Death date | c. 1300 |
| Occupation | Astrologer, Author, Advisor |
| Notable works | Liber Astronomiae |
| Era | High Middle Ages |
| Nationality | Italian |
| Main interests | Astrology, Astronomy |
Guido Bonatti was a medieval Italian astrologer and scholar active in the 13th century, best known for his treatise Liber Astronomiae. He served as an advisor to prominent rulers and communes in northern Italy, producing influential astrological texts that affected practices in Europe and the Mediterranean during the High Middle Ages. Bonatti’s works intersected with figures from the papacy to secular courts and were cited by later scholars in both Islamic and Christian intellectual traditions.
Bonatti is believed to have been born in the region around Florence or Forlì during the 13th century, contemporaneous with figures such as Frederick II, Holy Roman Emperor, Pope Innocent IV, and Thomas Aquinas. His formative years occurred amid the urban milieu of Florence, Bologna, and Padua, where academies and cathedral schools overlapped with the transmission of texts from Toledo and Sicily. The intellectual networks of Robert Grosseteste, Roger Bacon, and Albertus Magnus shaped the polemical and scholarly context in which Bonatti worked. He operated in the milieu of municipal communes like Bologna Commune and courts such as that of Charles I of Anjou, interacting with notaries, physicians, and clerics drawn from institutions like the University of Bologna and the University of Paris.
Bonatti’s principal work, Liber Astronomiae, compiled techniques of natal astrology, electional astrology, and interrogations, drawing on authorities such as Ptolemy, Albumasar, and Al-Biruni. His methods incorporated planetary positions, houses, and aspects alongside timing techniques found in the Arabic tradition transmitted through centers like Toledo School of Translators and Córdoba. Bonatti discussed planetary joys, terms, and bounds while referencing calendrical computations used by Bede and astronomical tables akin to the Alfonsine Tables. He employed horary procedures comparable to those in texts by Jabir ibn Aflah and Masha'allah, adapting Persian and Andalusian practices to Italian applications. His manual format influenced compendia circulated in libraries associated with Francesco Petrarch, Dante Alighieri, and collectors in the Visconti and Sforza courts.
Bonatti operated as a court consultant and municipal advisor, providing prognostications to rulers such as Charles I of Anjou and officials in communes like Forlì and Ravenna. He participated in the advisory culture alongside figures like Salimbene de Adam and engaged with agents tied to papal and imperial politics, including envoys of Pope Gregory X and supporters of Guelf and Ghibelline factions. His consultations addressed dynastic timings, military campaigns associated with battles such as Battle of Benevento and sieges like those at Montaperti, and civic decisions paralleling councils held in Siena and Pisa. Bonatti’s services were sought by merchants connected to Venice and bankers analogous to families like the Peruzzi and Bardi, reflecting the interplay between astrological counsel and urban economic elites.
Contemporaries and later chroniclers produced mixed assessments: some praised his technical skill while others accused him of superstition and deception. Chroniclers such as Salimbene de Adam and writers in the tradition of Matthew Paris recorded anecdotes that cast Bonatti in a controversial light, paralleling criticisms leveled at practitioners referenced in trials like the Trial of the Templars and debates during the University of Paris condemnations. Clerical authorities drew on positions espoused by Pope John XXII and synods that scrutinized astrological prognostication. Bonatti also faced rivalry from contemporaneous astrologers and magicians in the wake of works circulated by Johannes Hispalensis and medieval translators associated with Michael Scot.
Bonatti’s manuals circulated widely in manuscript and early print cultures, influencing later astrologers such as William Lilly and scholars in Renaissance centers like Padua and Florence. His integration of Arabic techniques into Latin astrology helped shape curricula in chanceries and apothecaries connected to families like the Medici and institutions such as the Accademia dei Lincei. Early modern commentators referenced Bonatti in polemics involving Girolamo Cardano, Marsilio Ficino, and critics in the milieu of Galileo Galilei. Manuscripts of Liber Astronomiae survive in collections once owned by collectors like Humfrey, Duke of Gloucester and catalogues from libraries such as the Vatican Library and the Biblioteca Nazionale Centrale di Firenze.
Bonatti appears, often anonymously or under veiled reference, in literary and polemical works from the late medieval to Renaissance periods, intersecting with authors like Dante Alighieri and Boccaccio who engaged with themes of divination and fate. Visual representations of astrologers in fresco cycles in Padua and illuminated manuscripts produced in workshops associated with patrons such as the Visconti family reflect the social role ascribed to figures like Bonatti. Later dramatists and antiquarians invoked his persona alongside legendary magicians like Merlin and historical astrologers cited in inventories of collectors including Giorgio Vasari.
Category:13th-century astrologers Category:Medieval Italian writers