While a great number of manuscripts of Augustine's De haeresibus add to the text chapters on the Christological heresies that arose after Augustine's death, modern editions offer only a confused picture of their transmission. This article identifies three distinct sets of additional chapters, and analyses their sources, possible origins and theological implications. It demonstrates that their authors were taking distinct positions in the debate over neo-Chalcedonianism, the interpretation of Chalcedonian Christology that started to became dominant in the early sixth century. The additions also provide evidence that many neo-Chalcedonians saw an Augustinian understanding of grace as complementary to their Christology.
