The first comprehensive monograph on the 'heretic' Marcion in nearly a century, this volume offers insight into second-century Christian intellectual debate and traces heresiological development. Judith M. Lieu analyses accounts of Marcion by the major early Christian polemicists who shaped the idea of heresy, including Justin Martyr, Irenaeus, Tertullian, Epiphanius of Salamis, Clement of Alexandria, Origen, and Ephraem Syrus. She examines Marcion's Gospel, Apostolikon, and Antitheses in detail