<p>Against Heresies is a work of Christian theology written in Greek about the year 180 by Irenaeus, the bishop of Lugdunum (now Lyon in France). In it, Irenaeus identifies and describes several schools of Gnosticism, as well as other schools of Christian thought, and contrasts their beliefs with orthodox Christianity. The treatise remains historically important as one of the first unambiguous attestations of the canonical gospel texts and some o...