Heinrich Cornelius Agrippa (1486–1535), a German magician, occult writer, theologian, astrologer, and alchemist, wrote the influential Three Books of Occult Philosophy, incorporating Kabbalah in its theory and practice of Western magic. It contributed strongly to the Renaissance view of ritual magic's relationship with Christianity.Farmer, S.A; "Syncretism in the West: Pico's 900 Theses (1486)", Medieval & Renaissance Texts & Studies, 1999, Giambattista della Porta expanded on many of these ideas in his Magia Naturalis.The Occult Sciences in the Renaissance: A Study in Intellectual Patterns by Wayne Shumaker (University of California Press, 1972) Giovanni Pico della Mirandola promoted a syncretic worldview combining Platonism, Neoplatonism, Aristotelianism, Hermeticism and Kabbalah.Farmer, S.A; "Syncretism in the West: Pico's 900 Theses (1486)", Medieval & Renaissance Texts & Studies, 1999,
