This study explores Marcion's ideas through his writings and the writings of early Christian polemicists who shaped the idea of heresy.

1. Introduction; Part I. The Polemical Making of Marcion the Heretic: 2. The beginnings of the construction of a heretic: Justin Martyr; 3. Irenaeus and the shaping of a heretic; 4. Marcion through Tertullian's eyes; 5. The heresiological tradition; 6. Theology and exegesis against Marcion; 7. Marcion in Syriac dress; Part II. Marcion through his Scriptures: 8. Marcion as editor and interpreter I: Marcion's Gospel; 9. Marcion as editor and interpreter II: Marcion's Apostolikon; 10. Marcion's other writings; Part III. The Second-Century Shaping of Marcion: 11. Marcion in his second-century context; 12. Principles of Marcion's thought and their context I: God; 13. Principles of Marcion's thought II: the Gospel; 14. Principles of Marcion's thought III: life and practice; 15. Principles of Marcion's thought IV: the contradictions of the Gospel; 16. Afterword: Marcion and the making of a heretic.

Judith M. Lieu is Lady Margaret's Professor of Divinity at the University of Cambridge. She has written numerous books, including I, II, and III John: A Commentary (2008), Christian Identity in the Jewish and Graeco-Roman World (2004), and Neither Jew nor Greek: Constructing Early Christianity (2002).