There is no credible place outside of Scripture that shows that Peter's Roman Bishopric was 25 years either. That's the point. Where is your first century proof?
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INDEED.
And certainly insufficient anything to build such an incredibly granitized, fossilized, tyrannical RELIGIOUS STRUCTURE and organization/institution of so much abusiveness to so many individuals over so many centuries!
As I have pointed out above, the precise length of Peter's bishopric in Rome is irrelevant to the legitimacy of the Catholic Church. Almost all scholars (Protestants included) agree that Peter was in Rome and that he was martyred in Rome. Archaeologists in the 1940s discovered what appears to be the tomb of Peter under the foundation of Old St. Peter's cathedral in the Vatican. The ancient graffiti said, "Peter is here". The skeleton inside is missing its feet, as if the feet were chopped off. That would make sense, since presumably the easiest way to remove from a cross the body of a man crucified upside down would be to chop off his feet.
-A8