This text focuses on the legal status of the Jews within the Roman Empire and the changes that this underwent when the empire became Christian. Conflicts between Roman and Jewish jurisdiction form an important theme, while particular studies deal with questions of conversion, the observance of the Sabbath and Festivals, Hadrian's decree prohibiting circumcision, and with the treatment given to the Samaritans. In the field of family law, Profesor Rabello looks at issues to do with the patria potestas, family courts, marriage and divorce, and it is in these areas, he would hold, that a basic understanding can be found of how the early Catholic Church treated Jews and Judaism.