0 SACRA PROPEDIEM ENCYCLICAL OF POPE BENEDICT XV ON THE THIRD ORDER OF ST. FRANCIS TO THE PATRIARCHS, PRIMATES, ARCHBISHOPS, BISHOPS, AND OTHER ORDINARIES IN PEACE AND COMMUNION WITH THE APOSTOLIC SEE. Venerable Brethren, Health and Apostolic The Benediction. We regard as most opportune that solemn festivities will be held for the seventh Centenary of the Third Order of Penance. Many motives prompt Us to exalt the occasion in the eyes of the Catholic world, in virtue of Our Apostolic authority, but before all is the hope of the incontestable advantages which the Christian people will draw therefrom.
Source: Sacra Propediem (Vatican.va)