(Jan) 13. Pius V. revises the little office of the Blessed Virgin, A.D. 1571. (Balinghem in Calend.)
Image (click it to enlarge): A page from the Hours
[Little Office of the B.V.M.] from 1465 A.D., owned by Charles, Duke of Normandy and brother of King Louis XI. Note: be sure to zoom in the picture and see a priest offering the Holy Mass, in the center of the page, above Our Lady's head. What detail!
The Little Office of the Blessed Virgin Mary is a shorter form of the Divine Office in honour of the Blessed Virgin Mary. It has long been the Church's daily liturgical prayer
to Our Lady, and these hours of praise have been used by Priests, religious and the laity throughout the centuries. Lay people used to flock to the great Cathedrals to publicly recite The Little Office during the Middle Ages.
Related Link: The Life Story of Pope St. Pius V
Source: "Historical Calendar of the Feasts of the Blessed Virgin, With the Foundations
and Churches Dedicated to Her", from Abbé Orsini's work, "Life of the Blessed Virgin Mary, Mother of God", Imprimatur 1858 A.D.