Technically I’d propose that the first real “Pope” was Clement:
en.wikipedia.org

He was the first one to really use the authority schtick, and may have been a real person (the ones before him are semi-mythical.)

BTW, that Wikipedia article reads as if it were written by believers who aren’t much into critical historiography. The evidence for 1st century Christianity is almost non-existent outside of later Church writers.