Paul referred to himself as being "of the stock of Israel, of the tribe of Benjamin, a Hebrew of the Hebrews; as touching the law, a Pharisee." [Phil. 3:5]

Eusebius of Caesarea in his Church History (320 AD) testifies that Paul was beheaded in Rome and Peter crucified. He wrote that the tombs of these two apostles, with their inscriptions, were extant in his time; and quotes as his authority a holy man of the name of Caius.

Paul's influence on Christian thinking arguably has been more significant than any other New Testament author.

A Roman Catholic liturgical solemnity of Peter and Paul, celebrated on June 29, commemorates his martyrdom, and reflects a tradition (preserved by Eusebius) that Peter and Paul were martyred at the same time. Source Wikipedia.