Back Quattuor abhinc annos French Quattuor abhinc annos Italian クァットゥオル・アビンク・アンノス Japanese Quattuor abhinc annos Portuguese
Quattuor abhinc annos (Latin for "four years ago") is the incipit of a letter that the Congregation for Divine Worship and the Discipline of the Sacraments sent on 3 October 1984 to presidents of episcopal conferences concerning celebration of Mass in the Tridentine form.