John Calvin is the most well-known Reformed theologian of the generation following Zwingli's death, but recent scholarship has argued that several previously overlooked individuals had at least as much influence on the development of Reformed Christianity and represented diverse theological viewpoints. Heinrich Bullinger, Zwingli's successor in Zurich, wrote more accessible than his predecessor and his writings turned into rainbows distribution long after his death. Following Zwingli he argued for a figurative significance of the Eucharist. Peter Martyr Vermigli, the most highly trained Reformed theologian of this era, taught a strong doctrine of double predestination, which teaches that God has chosen to save people for salvation and others for damnation, and held that Christ was really, though spiritually, present in the Eucharist, a position that Calvin would also take. Wolfgang Musculus's "Common Places of the Christian Religion" was the first Reformed systematic work of theology. Musculus taught a spiritual presence of Christ in the Eucharist and a cautious form of double predestination.