Frank R. Trombley has held visiting positions at Georgetown University, Dumbarton Oaks, University of California (Los Angeles), and King's College London. He is now a Lecturer in Religious Studies at Cardiff College, University of Wales.

This work treats the decline of Greek religion and the christianization of town and countryside in the eastern Roman Empire between the death of Julian the Apostate and the laws of Justinian the Great against paganism, c. 370-529. It examines such questions as the effect of the laws against sacrifice and sorcery, temple conversions, the degradation of pagan gods into daimones, the christianization of rite, and the social, political and economic background of conversion to Christianity. Several local contexts are examined in great detail: Gaza, Athens, Alexandria, Aphrodisias, central Asia Minor, northern Syria, the Nile basin, and the province of Arabia. It lays particular emphasis on the criticism of epigraphy, legal evidence, and hagiographic texts, and traces the demographic growth of Christianity and the chronology of this process in selected local contexts. It also seeks to understand the behavioral patterns of conversion.