0 To the Venerable Brethren, the Patriarchs, Primates, Archbishops, Bishops, and other Local Ordinaries in Peace and Communion with the Apostolic See. Venerable Brethren, Greetings and Apostolic Benediction. Among the pleasant recollections of Our younger days are the Encyclicals which Pope Leo XIII used to write to the whole Catholic world as the month of October drew near, in order to urge the faithful to devout recitation of Mary's rosary during that month in particular. (1)
Source: Grata Recordatio (Vatican.va)