To-day Christian Rome brings the Octave of her great apostles to an end. The importance, however, of these grand figures was such that, in the Middle Ages, their birthday formed as it were the center of a special liturgical cycle.
Protestants have tried to set Paul above Peter, by attributing to the former, rather even that to Christ himself, the foundations of the Church. Catholic theology and the Catholic catechism suffice to protect the faithful from falling into such heresies as these. Christ founded the Church on Peter, but He disposed that among the apostles Paul should be the chief propagator of the Gospel, and the most important interpreter of divine revelation.
(Source: The New Roman Missal, Rev. F. X. Lasance)