The triumph of Christ as King is celebrated on the last Sunday of October in the Extraordinary Form of the Latin Rite. Abbot Guerranger writes about this great celebration in The Liturgical Year:
"Christians have ever hailed our Divine Lord as King of Kings and Lord of Lords. It was as a King that the representatives of the Eastern world came to adore Him in the manger; it was as a King, albeit not knowing what he did, that the official representative of the western world lifted Him up on the Cross. The patriarchs and prophets of the old dispensation foretold His royalty; He spoke constantly of His Kingdom: when asked plainly whether He were in truth a King by the representative of Caesar, He acknowledged that such indeed He was, though of a Kingdom not of this world.
"His Kingship is founded upon the ineffable hypostatic union. It is spiritual, and concerned with spiritual things. It is opposed to none other than that of Satan, and to the powers of darkness. Christ is King over Angels and men; King over men's hearts and wills; His Kingship demands of its subjects a spirit of detachment from riches and earthly things, and a spirit of gentleness. They must hunger and thirst after justice and, more than this, they must deny themselves and carry the cross."
May all in heaven and earth acclaim your glory and never cease to praise you, O Christ our King!