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The Church remembers the martyrdoms of Peter and Paul, apostles and martyrs on June 29.
While there are no explicit testaments to the deaths of St. Peter or St. Paul in Scripture, and though they were not martyred at the same time, tradition has placed the commemoration of their deaths together, as a result of the Neronian persecution of Christians in 64 A.D. Placing the commemoration on June 29th was likely a reference to an event in 258 A.D. when the remains of the martyrs were moved from their resting places to avoid desecration during persecutions ordered by Valerian.
The martyrdoms of these apostles were markedly different. As a Roman citizen, Paul would probably have been beheaded with a sword. His death would have been faster and less painful than that of Peter, who, tradition holds, was crucified upside-down at his own request, considering himself unworthy of dying the same way as Jesus.
Images of Peter and Paul often include the instruments of their martyrdoms. Paul may be depicted holding a sword and holding open a book that reads “Spiritus Gladius,” or “sword of the Spirit.” This references both Paul’s beheading with a sword and his letter to the Ephesians, in which he asks the Church to take up “the sword of the Spirit, which is the word of God” (Eph. 6:17). Peter, along with his traditional symbols of keys to the kingdom of heaven, is regularly depicted with an inverted cross.
The relationship between the two can be instructive to us as modern-day Christians. Paul, the well-educated and cosmopolitan Jew of the Dispersion, and Peter, the uneducated fisherman from Galilee, had differences of opinion in the early years of the Church concerning the mission to the Gentiles. More than once, Paul speaks of rebuking Peter for his continued insistence on Jewish exclusiveness; yet their common commitment to Christ and the proclamation of the Gospel proved stronger than their differences; and both eventually carried that mission to Rome.