Can a false pope become a saint?
Chain of thought:
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A false pope, or antipope, is someone that tries to claim they are the true pope but the church rejects them. Hippolytus (c. 170–235 AD) headed a schismatic group as a rival to the Bishop of Rome, thus becoming an antipope. Hippolytus (c. 170–235 AD) was named a saint in the Roman Catholic Church. The answer is yes.
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