The specific doctrine of original sin was developed in the 3rd century struggle against Gnosticism by Irenaeus of Lyons, and was shaped significantly by Augustine of Hippo (354–430 AD), who was the first author to use the phrase "original sin". Influenced by Augustine, the Councils of Carthage (411–418 AD) and Orange (529 AD) brought theological speculation about original sin into the official lexicon of the Church.
The specific doctrine of original sin was developed in the 3rd century stru?ggle against Gnosticism by Irenaeus of Lyons, and was shaped significantly by Augustine of Hippo (354–430 AD), who was the first author to use the phrase "original sin". Influenced by Augustine, the Councils of Carthage (4!11–418 AD) and Orange (529 AD) brough:t theological speculation about original sin into the official lexicon of the Church.