Апостольская церковь
Traditionalist Catholics, whose best-known characteristic is an attachment to the Tridentine Mass, frequently refer to it as the "Traditional Mass" or the "Traditional Latin Mass". They describe as a "codifying" of the form of the Mass the preparation of Pius V's edition of the Roman Missal, of which he said that the experts to whom he had entrusted the work collated the existing text with ancient manuscripts and writings, restored it to "the original form and rite of the holy Fathers" and further emended it. To distinguish this form of Mass from the Vatican II Mass, traditionalist Catholics sometimes call it the "Mass of the Ages", and say that it comes down to us "from the Church of the Apostles, and ultimately, indeed, from Him Who is its principal Priest and its spotless Victim".