Ippolito Galantini was a 16th-century Italian preacher and educator born in Florence. Despite his early desire to join the Capuchin Order, his health prevented him from entering religious life, leading him to establish an influential educational movement instead. He founded the Congregation of Christian Doctrine in 1604, which significantly changed the way subjects were taught in Florence. Because of his dedicated work in teaching, Pope Leo XI referred to him as the "Apostle of Florence."