CHRIST THE KING Pope Pius XI established the feast of Christ the King

– The pope wrote in affirmation of the Social kingship of Christ:

     If we ponder this matter more deeply, we cannot but see that the title and the power of King belongs to Christ as man in the strict and proper sense too. For it is only as man that he may be said to have received from the Father “power and glory and a kingdom,” since the Word of God, as consubstantial with the Father, has all things in common with him, and therefore has necessarily supreme and absolute dominion over all things created.
     Supreme and absolute dominion over all things created.” It wouldn’t be a daring wager to say that nearly every Christian alive today would agree that Christ’s dominion over nature, over creatures, and the universe itself is absolute. But this statement finds not a few objectors when applied to the civic sphere. For if Christ is indeed a king — The King of Kings — then surely, every nation on earth must owe Him homage.
     When once men recognize, both in private and in public life, that Christ is King, society will at last receive the great blessings of real liberty, well-ordered discipline, peace and harmony. Our Lord’s regal office invests the human authority of princes and rulers with a religious significance; it ennobles the citizen’s duty of obedience. It is for this reason that St. Paul, while bidding wives revere Christ in their husbands, and slaves respect Christ in their masters, warns them to give obedience to them not as men, but as the vicegerents of Christ; for it is not meet that men redeemed by Christ should serve their fellow-men.
“You are bought with a price; be not made the bond-slaves of men.”
 If princes and magistrates duly elected are filled with the persuasion that they rule, not by their own right, but by the mandate and in the place of the Divine King, they will exercise their authority piously and wisely, and they will make laws and administer them, having in view the common good and also the human dignity of their subjects. 
     The result will be a stable peace and tranquility, for there will be no longer any cause of discontent. Men will see in their king or in their rulers men like themselves, perhaps unworthy or open to criticism, but they will not on that account refuse obedience if they see reflected in them the authority of Christ God and Man. Peace and harmony, too, will result; for with the spread and the universal extent of the kingdom of Christ men will become more and more conscious of the link that binds them together, and thus many conflicts will be either prevented entirely or at least their bitterness will be diminished.

~ (From the Encyclical Letter Quas Primas by Pope Pius XI)