Christ's kingship was addressed in the encyclical Quas Primas of Pope Pius XI, published in 1925, which has been called "possibly one of the most misunderstood and ignored encyclicals of all time." The Pontiff's encyclical quotes with approval Cyril of Alexandria, noting that Jesus's kingship was given to him by the Father, and was not obtained by violence: "'Christ,' he says, 'has dominion over all creatures, a dominion not seized by violence nor usurped, but his by essence and by nature.'" Pope Pius XI instituted the feast of Christ the King in 1925 to remind Christians that their allegiance was to their spiritual ruler in heaven as opposed to earthly supremacy. Pope Benedict XVI remarked that Christ's kingship is not based on "human power" but on loving and serving others. 
Insigna of the Vendean insurgents who fought against suppression of the Church in the French Revolution. Note the French words 'Dieu Le Roi' beneath the heart-and-cross, meaning 'God (is) the king'.
Schools, churches, and Shrine
Many Catholic schools and churches have taken this name, as shown here:
Cathedral of Christ the King, Lexington Kentucky
Christ the King Roman Catholic Church and School, Denver, Colorado
Shrine of Christ the King Sovereign Priest, Chicago, Illinois
Jesus of Nazareth, King of the Jews is the fullest form of the inscription and is given in the Gospel of John (19:19), the writer of which claiming to be an eyewitness. The three Synoptic Gospels all report that the title "King of the Jews" was inscribed on the titulus attached to the cross by the Romans (indicating a misguided sentence of revolutionarysedition), and which is found on many crucifixes.
Cristo Rey, the Spanish translation used for several placenames.