Last year, as each of you is aware, We decreed by an Encyclical Letter that, to win the help of Heaven for the Church in her trials, the great Mother of God should be honored by the means of the most holy Rosary during the whole of the month of October. In this we followed both Our own impulse and the example of Our predecessors, who in times of difficulty were wont to have recourse with increased fervor to the Blessed Virgin, and to seek her aid with special prayers. . .
Pope Pius XIII, Superiore Anno, 1884