Quam singulari was a decree released by Pope Pius X in 1910, concerning the admittance of children to the Eucharist. This followed a decree by the Sacred Congregation of the Council, five years before on frequent Communion.

Pope Pius X was head of the Catholic Church from 4 August 1903 to his death in August 1914. Pius X is known for vigorously opposing modernist interpretations of Catholic doctrine, and for promoting liturgical reforms and scholastic theology. He initiated the preparation of the 1917 Code of Canon Law, the first comprehensive and systemic work of its kind. He is venerated as a saint in the Catholic Church. The Society of Saint Pius X, a traditionalist Catholic fraternity formed decades after his death, is named after him.