Celsus

Celsus (; , ''Kélsos''; ) was a 2nd-century Greek philosopher and opponent of early Christianity. His literary work ''The True Word'' (also ''Account'', ''Doctrine'' or ''Discourse''; Greek: ) survives exclusively via quotations in ''Contra Celsum'', a refutation written in 248 by Origen of Alexandria. ''The True Word'' is the earliest known comprehensive criticism of Christianity and Judaism.

Hanegraaff has argued that ''The True Word'' was written shortly after the death of Justin Martyr (who was possibly the first Christian apologist), and was probably a response to his work. Origen stated that Celsus was from the first half of the 2nd century AD, although the majority of modern scholars have come to a general consensus that Celsus probably wrote around AD 170 to 180. Provided by Wikipedia