(from

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power ...

: "In the first") was an encyclical of

Pope Pius XI Pope Pius XI ( it, Pio XI), born Ambrogio Damiano Achille Ratti (; 31 May 1857 – 10 February 1939), was head of the Catholic Church from 6 February 1922 to his death in February 1939. He was the first sovereign of Vatican City fr ...

. Promulgated on December 11, 1925, it introduced the

Feast of Christ the King The Solemnity of Our Lord Jesus Christ, King of the Universe, commonly referred to as the Feast of Christ the King, Christ the King Sunday or Reign of Christ Sunday, is a feast in the liturgical year which emphasises the true kingship of Christ ...

Purpose and content

''Quas primas'' followed Pius's initial encyclical, '' Ubi arcano Dei consilio'', which he referred to in his opening statement:

...manifold evils in the world were due to the fact that the majority of men had thrust Jesus Christ and his holy law out of their lives; that these had no place either in private affairs or in politics: and we said further, that as long as individuals and states refused to submit to the rule of our Savior, there would be no really hopeful prospect of a lasting peace among nations.

In ''Ubi arcano'', Pius enjoined the faithful to seek "the Peace of Christ in the Kingdom of Christ". ''Quas primas'' established the

, which was

's response to the world's increasing secularization and nationalism. It was written in the aftermath of World War I and the

Revolutions of 1917–1923 The Revolutions of 1917–1923 was a revolutionary wave that included political unrest and armed revolts around the world inspired by the success of the Russian Revolution and the disorder created by the aftermath of World War I. The uprisings ...

, which saw the fall of the

Hohenzollerns