Elena 
The Feast of Christ the King was started in 1925 by Pope Pius XI (famous for that well-known and much debated Casti Connubi) in his Encyclical Quas Primas:
Written smack dab in the middle of the “Roaring 20s” Pius felt a need to focus the church and the world back to the sovereignty of Jesus Christ as God and King.
Quas Primas is fascinating in that it speaks to us today as if it was written specifically for the early 21st century! These parts stood out for me, but the entire document is very well worth the trouble to read it!
In the first Encyclical Letter which We addressed at the beginning of Our Pontificate to the Bishops of the universal Church, We referred to the chief causes of the difficulties under which mankind was laboring. And We remember saying that these 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. Men must look for the peace of Christ in the Kingdom of Christ
16. Christ as our Redeemer purchased the Church at the price of his own blood; as priest he offered himself, and continues to offer himself as a victim for our sins. Is it not evident, then, that his kingly dignity partakes in a manner of both these offices?
17. It would be a grave error, on the other hand, to say that Christ has no authority whatever in civil affairs, since, by virtue of the absolute empire over all creatures committed to him by the Father, all things are in his power. Nevertheless, during his life on earth he refrained from the exercise of such authority, and although he himself disdained to possess or to care for earthly goods, he did not, nor does he today, interfere with those who possess them. Non eripit mortalia qui regna dat caelestia.[27]
33. The faithful, moreover, by meditating upon these truths, will gain much strength and courage, enabling them to form their lives after the true Christian ideal. If to Christ our Lord is given all power in heaven and on earth; if all men, purchased by his precious blood, are by a new right subjected to his dominion; if this power embraces all men, it must be clear that not one of our faculties is exempt from his empire. He must reign in our minds, which should assent with perfect submission and firm belief to revealed truths and to the doctrines of Christ. He must reign in our wills, which should obey the laws and precepts of God. He must reign in our hearts, which should spurn natural desires and love God above all things, and cleave to him alone. He must reign in our bodies and in our members, which should serve as instruments for the interior sanctification of our souls, or to use the words of the Apostle Paul, as instruments of justice unto God.[35] If all these truths are presented to the faithful for their consideration, they will prove a powerful incentive to perfection.
Prayer Source: Enchiridion of Indulgences , June 29, 1968
Christ the King
Originally uploaded by Loci Lenar
A partial indulgence is granted to the faithful, who piously recite the Act of Dedication of the Human Race to Jesus Christ King. A plenary indulgence is granted, if it is recited publicly on the feast of our Lord Jesus Christ King.
Most sweet Jesus,Redeemer of the human race, look down upon us humbly prostrate before you. We are yours, and yours we wish to be; but to be more surely united with you, behold each one of us freely consecrates himself today to your Most Sacred Heart. Many indeed have never known you; many, too, despising your precepts, have rejected you. Have mercy on them all, most merciful Jesus, and draw them to your Sacred Heart. Be King, O Lord, not only of the faithful who have never forsaken you, but also of the prodigal children who have abandoned you; grant that they may quickly return to their Father’s house, lest they die of wretchedness and hunger. Be King of those who are deceived by erroneous opinions, or whom discord keeps aloof, and call them back to the harbor of truth and the unity of faith, so that soon there may be but one flock and one Shepherd. Grant, O Lord, to your Church assurance of freedom and immunity from harm; give tranquility of order to all nations; make the earth resound from pole to pole with one cry: Praise to the divine Heart that wrought our salvation; to it be glory and honor for ever. Amen.
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Some good links for noting this feast day!
Castle of the Immaculate: Shrinky Dinks for Christ the King
Catholic Culture
Women of Faith and Family
Christ the King – liturgical tea.
The New Liturgical year – Under Her Starry Mantle.
