For the early Christians, "pagan" referred to a multitude of unbelievers: Greek and Roman devotees of the Olympian gods, and "barbarians" such as Arabs and Germans with their own array of deities. But while these groups were clearly outsiders or idolaters, who and what was pagan depended on the outlook of the observer, as Christopher Jones shows in this fresh and penetrating analysis. Treating paganism as a historical construct rather than a fixed...