Supremi apostolatus officio
PAPAL ENCYCLICAL BY LEO XIII
Supremi Apostolatus; Supremi Apostolatus Officio; Supremi apostolatus
Supremi apostolatus officio (The Supreme Apostolic Office), commonly referred to as "On Devotion of the Rosary", is the first of a number of encyclicals of Pope Leo XIII on the Rosary. It was issued on September 1, 1883, encouraging the practice.