Irenaeus ([[130]] - [[202]] AD) was an important early Christian who wrote against [[Gnosticism]]. He was originally from Asia Minor and later became Bishop of Lyon (South Gaul).
He was a strong opponent of Gnosticism, writing
* Refutation and Overthrow of the Knowledge Falsely So-Called (Other names: "Against Heresies" and "Five Books Against Heresies")
* Demonstration of Apostolic Faith
Traditionally, he is believed to have died a martyr's death.