Peter was the brother of St Andrew and a Galilean fisherman. He was called by the Lord and, despite his obvious human weaknesses, eventually chosen as the leader of the Twelve, the “rock” on which the Church was built. After Pentecost, he became particularly associated with Antioch and then Rome. He was crucified upside down under Nero and was buried at the Vatican around 64.
Paul was a tent-maker fro Tarsus (then capital of the Roman province of Cilicia, now in Turkey), a Pharisee and a Roman citizen. He was initially a persecutor of the Christians but was converted by the Lord on his way to Damascus. He became the Apostle of the Gentiles, preaching the Gospel to the uncircumcised, reaching Greece, Italy, Malta and possibly even Spain. He was beheaded along the Via Ostiense and buried nearby, on the site where the basilica bearing his name now stands. – CTS New Daily Roman Missal 2012, p 2791