If Peter was not the first pope, then who was?

Catholics know via the Bible, tradition, and history that the Apostle Peter was the first pope. Protestants and Evangelicals believe otherwise.

So if Peter was not the first pope, who was? When, where, how, and by whose authority did the first pope become the pope?

If Peter was not the first pope, then who was?
"Oh yeah, also, for no reason at all, Im changing your name from Simon to Peter"
"Oh yeah, also, for no reason at all, I'm changing your name from 'Simon' to 'Peter'"
If Peter was not the first pope, then who was?
If Peter was not the first pope, then who was?
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