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- DictionaryIrenaeus, St/ˌʌɪərɪˈniːəs/
- 1. (c. 130–c. 200 ad), Greek theologian, the author of Against Heresies (c. 180), a detailed attack on Gnosticism. Feast day (in the Eastern Church) 23 August; (in the Western Church) 28 June.
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