The religious life within and around the Roman Empire, and the context into which Christianity emerged and where it spread, provides a topic of the widest interest. Yet this context was not that of a completely pagan world, for Judaism was already firmly established and continued as a vigorous contender in the field throughout the first four centuries after the death of Christ - a fact not always well recognized. Historically, Christianity's relationship with Judaism continued to be intimate but ambivalent long after their separation. This has distorted scholarly perceptions right down to our...