Florentius de Faxolis, in Italian Fiorenzo de' Fasoli ( – 18 March 1496), was an Italian priest and music theorist.Clement A. Miller and Bonnie J. Blackburn, "Florentius de Faxolis", Grove Music Online (Oxford University Press, 2019 ), retrieved 26 May 2022.

Florentius entered the pay of Cardinal Ascanio Sforza in 1481–1482, while the cardinal was living in Rome and Naples. His rise after this was rapid. In 1482, he obtained a canonry in the collegiate church of San Fiorenzo in Fiorenzuola d'Arda. In 1483, he was appointed chaplain of in Milan. In 1484, he received a papal dispensation allowing him to become a priest before the canonical age.

At the cardinal's behest, Florentius wrote a treatise in Latin on music theory, the Liber musices (Book of Music), between 1485 and 1492.Miller and Blackburn in Grove accept this identification, but acknowledge that Francesco Rocco Rossi disagrees, believing that the Florentius who wrote the Liber "was a Spanish musician in Naples". It is preserved in a single manuscript—now in Milan, , 2146—illuminated by Attavante degli Attavanti or his atelier.Blackburn and Holford-Strevens edition, p. 238. It contains 95 folios and is divided into three books. The only contemporary theorist cited by Florentius is Blasius Romero. The work closes with a poem by Francesco Tranchedino.

Editions Book on Music, ed. Bonnie J. Blackburn and Leofranc Holford-Strevens (Harvard University Press, 2010). Un manuale di musica per Ascanio Sforza: il Liber Musices di Florentius (Ms. 2146 della Biblioteca Trivulziana di Milano), ed. Francesco Rocco Rossi (PhD diss., University of Pavia, 2007), vols. 1 and 2.

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