Pope Leo XIII was head of the Catholic Church from 20 February 1878 until his death in July 1903. Living until the age of 93, he was the oldest pope, whose age can be validated, holding office and had the fourth-longest reign of any pope, behind those of St. Peter, Pius IX and John Paul II.

The Rosary, also known as the Dominican Rosary, refers to a set of prayers used primarily in the Catholic Church, and to the physical string of knots or beads used to count the component prayers. When referring to the prayer, the word is usually capitalized ; when referring to the prayer beads as an object, it is written with a lower-case initial letter.