Today Holy Mother Church triumphantly celebrates the Dedication of the Archbasilica of Our Savior Jesus Christ (aka The Basilica of St. John Lateran). It's association with the name of Lateran is due to that fact that the Church was in ancient times occupied by the palace of the Laterani family.
The palace of the Laterani, on the Coelian Hill, belonged then to Constantine's wife Fausta. After his conversion the Emperor gave it to the Pope as his private residence and founded in it the church of the Lateran which became the mother and mistress of all the churches of Rome and the world. It was dedicated to Christ our Saviour by Pope St. Silvester on November 9, 324. In the twelfth century it was given as its second title St. John the Baptist whose name was also that of the ancient baptistery connected with the church; hence the present name of the basilica, St. John Lateran. The first basilica having been destroyed, it was rebuilt in the tenth century by Sergius III and consecrated by Benedict XIII in 1726.
Source: Passionist Nuns
The Proper of the Mass for today's Mass of the Dedication of St. John Lateran is called the Missa Terribilis, taken from the beginning Introit from Genesis 28: 17, "Terribilis est locus iste..." Translated: "Terrible is this place: it is the house of God, and the gate of Heaven; and it shall be called the court of God."
Now the meaning here of "terrible" is awesome, awestruck, for it is derived from the Latin word terrere meaning "to terrify" in the sense that we should be terrified in the presence of the Almighty. Yet so many have downplayed this, forsaking reverence to Him and treating devotion as nothing more than outmoded superstition which doesn't compute with modern thinking.
The proper prayers for today's Mass in PDF please click here: Page 1 & Page 2
Dedication of the Basilica of our Savior Propers
INTROIT Genesis 28. 17
Terrible is this place: it is the House of God, and the gate of Heaven; and it shall be called the Court of God. -- (Ps. 83. 2, 3). How lovely are Thy tabernacles, O Lord of Hosts! my soul longeth and fainteth for the Courts of the Lord. V.: Glory be to the Father . . . -- Terrible is this place . . .
O God, who year by year dost renew for us the day of consecration of this Thy holy temple, and dost ever bring us again in safety to these holy Mysteries: hear the prayers of Thy people and grant: that whosoever enters this Temple to ask blessings of Thee, may rejoice in the obtaining of all his petitions. Through our Lord Jesus Christ, Thy Son, Who liveth and reigneth with Thee in the unity of the Holy Ghost, God, world without end.
EPISTLE Apoc. 21. 2-5
In those days I saw the holy city, the new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband. And I heard a great voice from the throne, saying: Behold the tabernacle of God with men, and He will dwell with them. And they shall be His people, and God Himself with them shall be their God: and God shall wipe away all tears from their eyes: and death shall be no more, nor mourning, nor crying, nor sorrow shall be any more, for the former things are passed away. And He that sat on the throne, said: Behold, I make all things new.
GRADUAL/ALLELUIA Exodus 15. 11, 6.
This place was made by God, a priceless mystery, it is without reproof. V.: O God, before Whom stands the choir of Angels, give ear to the prayers of Thy servants. Alleluia, alleluia. V. (Ps. 137. 2). I will worship towards Thy holy temple: and I will give glory to Thy Name. Alleluia.
At that time, Jesus entering in, walked through Jericho. And behold, there was a man named Zacheus, who was the chief of the publicans, and he was rich. And he sought to see Jesus who He was: and he could not for the crowd, because he was low of stature. And running before, he climbed up into a sycamore tree, that he might see Him: for He was to pass that way. And when Jesus was come to the place, looking up, He saw him, and said to him: Zacheus, make haste and come down: for this day I must abide in thy house. And he made haste and came down, and received Him with joy. And when all saw it, they murmured, saying, that He was gone to be a guest with a man that was a sinner. But Zacheus standing, said to the Lord: Behold, Lord, the half of my goods I give to the poor; and if I have wronged any man of any thing, I restore him fourfold. Jesus said to him: This day is salvation come to this house: because he also is a son of Abraham. For the Son of Man is come to seek and to save that which was lost.
OFFERTORY ANTIPHON 1 Par. 29. 17-18
O Lord God, in the simplicity of my heart I have joyfully offered all these things; and I have seen with great joy Thy people which are here present: O God of Israel, keep this will.
Give heed, we beseech Thee, O Lord, to our prayers: (that all we who are assembled within this temple, to keep the anniversary day of its dedication, may please Thee by full and perfect devotion of body and soul:) that while we set before Thee these present gifts, we may be found worthy, by Thy help, to come to everlasting rewards. Through our Lord Jesus Christ, Thy Son, Who liveth and reigneth with Thee in the unity of the Holy Ghost, God, world without end.
The words of this prayer in parentheses are said only in the Lateran Basilica itself.
COMMUNION ANTIPHON Matthew 21. 13
My house shall be called a house of prayer, saith the Lord: in it every one that asketh, receiveth: and he that seeketh, findeth, and to him that knocketh it shall be opened.
O God, who, out of living and chosen stones dost prepare an eternal dwelling-place for Thy Majesty: help Thy suppliant people: that as Thy Church profits by material expansion, so may it also grow by spiritual increase. Through our Lord Jesus Christ, Thy Son, Who liveth and reigneth with Thee in the unity of the Holy Ghost, God, world without end.