The Papal Claim to Have the Keys of the Apostle Peter

For most Catholics, the authority of the Pope, as derived from Peter, is the main cornerstone of their faith.  For the others, it is the lifesaver to fall back on when all else fails. The Petrine primacy of the Pope is an historic holdover from the false Decretals of Constantine and Isidore.  Nonetheless, the Papacy is the bulwark and foundation of the Church of Rome.