When researching the fascinating religions of ancient Rome, Réville's study is frequently found. Affording a thorough introduction to Roman religious society of the third century from the stoicism of Marcus Aurelius to the syncretism of Severus, Réville offers insight on every page. Syncretism dominates his discussion of the first half of the third century. Moving on to the religious reform under the Severides, Réville demonstrates the Neopythagorean aspect of the reformation. Yielding lasting results, this study of ancient religion will be welcomed by eager readers interested in the history of religions.