In this engaging and provocative study, John Peter Kenney examines the emergence of monotheism within Greco-Roman philosophical theology by tracing the changing character of ancient realism from Plato through Plotinus. Besides acknowledging the philosophical and theological significance of such ancient thinkers as Plutarch, Numenius, Alcinous, and Atticus, he demonstrates the central importance of Plotinus in clarifying the relation of the intelligible...