The Roman Martyrs contains translations of forty Latin passiones of saints who were martyred in Rome or its near environs, during the period before the "peace of the Church" (c. 312). Some of the Roman martyrs are universally known-SS. Agnes, Sebastian or Laurence, for example-but others are scarcely recognized outside the ecclesiastical landscape of Rome itself. Each of the translated passiones is accompanied by an individual introduction and commentary;...