Bartolo da San Gimignano was a 13th-century Italian priest belonging to the Third Order of Saint Francis. Born in 1228 to noble counts near Siena, he eventually left his family to pursue religious life. He served within Benedictine infirmaries located in Pisa before contracting leprosy around 1280. He spent his remaining years living in a leper hospital in San Gimignano, where he died on December 12, 1300, due to the disease.