If you're like us, sometimes you may wonder what happened to the people in the New Testament after everything was written. For example, what happened to Peter after he wrote his two letters? Well, tracking that down can be tough because few first-hand accounts have come down to us. While the Bible was preserved through the years, not everything else was.
But that doesn't mean we can't dig into history to at least get a glimpse of the lives of the apostles. One of our favorites on this topic is Fox's Book of Martyrs, which chronicles the lives of each apostle and what likely happened to him, as well the lives of Christians throughout the history of the church.
Here's the entry on Peter:
Among many other saints, the blessed apostle Peter was condemned to death, and crucified, as some write, at Rome; albeit some others, and not without cause, do doubt thereof. Hegesippus says that Nero sought matter against Peter to put him to death; which, when the people perceived, they entreated Peter with much ado that he would flee the city. Peter, through their importunity at length persuaded, prepared himself to avoid. But, coming to the gate, he saw the Lord Christ come to meet him, to whom he, worshipping, said, "Lord, where are you going?" To whom He answered and said, "I am come again to be crucified." By this, Peter, perceiving his suffering to be understood, returned into the city. Jerome says that he was crucified, his head being down and his feet upward, himself so requiring, because he was (he said) unworthy to be crucified after the same form and manner as the Lord was .
And you'll find much more where that came from.