If someone converts to Judaism, but later credible evidence is found that he was already Jewish (say, due to a distant matrilineal ancestress), is he still treated as a convert for halachic purposes?

Does the conversion certificate say "not valid if he turns out to be already Jewish"? Or is it "Once converted, always converted"?

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    Why would he not be treated as jewish if valid evidence is discovered. Note that the question is just as valid if it involves his mother's mother. A farther ancestor might require a conversion misafek. I actually knew someone who converted because of a doubt. – sabbahillel Sep 10 at 2:42
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    I'm not understanding your question. In terms of halachic requirements, how is a convert different from any other Jew? Can you specify which areas of halacha he may be treated differently? – DanF Sep 10 at 14:27
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    @DanF a female convert can't marry a kohen. – Double AA Sep 11 at 15:45
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    "Converting" someone who was really born Jewish, is an exercise in futility. – IsraelReader Sep 12 at 12:10
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    a jew cannot convert to judaism – wfb Sep 12 at 16:44

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