Promulgation of Quas Primas

Date: December 11, 1925 • Location: Rome, Italy

Pope Pius XI promulgated the encyclical Quas primas, establishing the Feast of Christ the King.

Pope Pius XI was head of the Catholic Church from 6 February 1922 until his death in February 1939. He was also the first sovereign of Vatican City upon its creation on 11 February 1929.