“He who deserts the chair of Peter, upon whom the Church was founded, does he trust himself to be in the Church?” (St. Cyprian, Bishop of Carthage and Martyr, De Catholicae Ecclesiae Unitate, A.D. 251)
The Memorial of Saints Cornelius, Pope ( † A.D. 253) and Cyprian, Bishop ( † A.D. 258), Martyrs is September 16. The Feast of the Chair of Peter, Apostle is February 22.