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'.
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' kingship is 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 has remarked that Christ's kingship is not based on "human power" but on loving and serving others. The perfect exemplar of that acceptance, he pointed out, is the Virgin Mary. Her humble and unconditional acceptance of God's will in her life, the Pope noted, was the reason that "God exalted her over all other creatures, and Christ crowned her Queen of heaven and earth." 
Schools, churches, and Shrine
Many Catholic schools and churches have taken this name, as shown here: Cathedral of Christ the King, Lexington Kentucky
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.
The Roman Catholic Church,the Anglican Church, and the Lutheran Church celebrate the Feast of Christ the King on the last Sunday of the liturgical year (Ordinary Form of the Roman Rite) and on the last Sunday in October, immediately before the feast of All Saints (Extraordinary Form of the Roman Rite). It is a solemnity in the Roman Catholic Calendar. The Feast of Christ the King is followed by the First Sunday of Advent, the beginning of the liturgical year. Paola, Malta celebrates it on the third Sunday of July.
Cristo Rey, the Spanish translation used for several placenames.