Bonaventura of Iseo (died ) was an Italian Friar Minor, diplomat, theologist and alchemist.
Life and work Bonaventura da Iseo played an important role in the Franciscan Order (Ordo Fratrum Minorum) as fiduciary of Elias of Cortona and later of Crescentius of Jesi, whose he was Vicar around the First Council of Lyon in 1245.
Friend of Albertus MagnusCharles Burnett (2012), How Albert the Great's Speculum astronomiae was Interpreted and Used by Four Centuries of Readers: A Study in Late Medieval Medicine, Astronomy, and Astrology (review) and of Thomas Aquinas, he was Franciscan Minister Provincial, in particular in the March of Treviso under Ezzelini.
Bonaventura of Iseo has traditionally been seen as the author of Liber compostille, an alchemical technical textbook. His work illustrates the spread of alchemia in the Italian Franciscan Order.
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