The expansion of Christianity and the codification of Roman law are two of the most significant facets of late antiquity. The Collatio Legum Mosaicarum et Romanarum, or Collation of the Laws of Moses and the Romans, is one of the most perplexing works of late antiquity: a law book compiled at the end of the fourth century by an anonymous editor who wanted to show the similarity between laws of the Hebrew Bible, or Old Testament, and Roman law. Citing...