Heresy is always relative; the traces that it leaves to us are distorted and one-sided. In the last few decades, historians have responded to these problems by developing increasingly sophisticated methodologies that help to unravel and illuminate the tangled layers from which the texts that describe heresy are built, but in the process have made our reading of heresy fractured and disconnected. Heresy and Heretics seeks to redress this by reading the different types of anti-heretical writing as part of a wider, connected tradition, considering all the principal orthodox treatments of heresy f.