jan 1, 170 - Irenaeus's "Against Heresies"

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Christian author Iraeneus writes Agaisnt Heresies, the most extensive second-hand account of Christian diversity, using well-known polemical labels to target Marcion, Valentinus, and many other Christian teachers and groups. He also discusses a number of gospels, argues against gospels by "gnostics" like Valentinus (e.g., Gospel of Truth), argues against others (Marcion, Ebionites) for only using one gospels, and defends the use of no more and no less than four gospels (Mark, Matthew, Luke, John) as "orthodox"

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