What happened to Peter after he denied Jesus?

St. Peter “wept bitterly” (Mt. 26:75) when he realized his betrayal. After the Resurrection, when the Lord appeared to the Apostles in Galilee, the Lord affirmed His forgiveness when He re-confirming Peter’s role of feeding and guiding the Lord’s flock, as well as the manner of Peter’s own death (John 21:15-19). Peter would die in Nero’s Circus on Vatican Hill about 66 A.D., crucified up-side-down in mockery of Christ’s crucifixion.