Plato's doctrine of the soul, its immaterial nature, its parts or faculties, and its fate after death (and before birth) came to have an enormous influence on the great religious traditions that sprang up in late antiquity, beginning with Judaism (in the person of Philo of Alexandria), and continuing with Christianity, from St. Paul on through the Alexandrian and Cappadocian Fathers to Byzantium, and finally with Islamic thinkers from Al-kindi on. This volume, while not aspiring to completeness, attempts to provide insights into how members of each of these traditions adapted Platonist doctrines to their own particular needs, with varying degrees of creativity.