Against Heresies

Summary

Against Heresies is a work of Christian theology written in Greek by Irenaeus, the bishop of Lugdunum . Due to its reference to Eleutherus as the current bishop of Rome, the work is usually dated c. 180. In it, Irenaeus identifies and describes several schools of Gnosticism, and other schools of Christian thought, whose beliefs he rejects as heresy. He contrasts them with orthodox Christianity.