 After returning to Padua in 1499, he taught natural philosophy there until 1509, when the university closed due to the War of the League of Cambrai. He stayed briefly in Ferrara, where he taught at the university for a year, and then returned to his native Mantua, before moving to the university of Bologna in 1511. He remained there for the rest of his life, teaching natural and moral philosophy (Oliva 1926: 265). His years at Bologna were both productive and filled with controversy, including being unsuccessfully accused of heresy in 1514 and in 1518 (Nardi 1965: 70; Bianchi 2008: 132). All his works printed during the sixteenth century stem from his tenure at Bologna (Lohr 1988: 347–62). In 1514 he completed a disputation on the intension and remission of forms; and in 1515 he published the question De reactione (On Reaction). A year later he published Tractatus de immortalitate animae (Treatise on the Immortality of the Soul). The work defends a materialist reading of Aristotle in which the human soul depends on and perishes with the body. The treatise came out three years after the Fifth Lateran Council issued the bull Apostolici regiminis. The bull demanded that philosophers refrain from teaching that the soul is one in number or mortal and that the universe eternal. It also demanded that philosophers defend Christian doctrine to the best of their ability. As Pomponazzi’s teaching appeared to many to run against the bull, he was attacked, but also defended, by a number of scholars and ecclesiastical authorities. Although he was denounced as a heretic, he was not tried and never abjured, protected by the powerful Venetian Cardinal Pietro Bembo (see Bianchi 2008: 130–34; Pine 1986: 124–28).