Old Calendar: Transfiguration of Our Lord; St. Sixtus II, pope & Felicissimus & Agapitus, martyrs
This feast became widespread in the West in the 11th century and was introduced into the Roman calendar in 1457 to commemorate the victory over Islam in Belgrade. Before that, the Transfiguration of the Lord was celebrated in the Syrian, Byzantine, and Coptic rites. The Transfiguration foretells the glory of the Lord as God, and His Ascension into heaven. It anticipates the glory of heaven, where we shall see God face to face. Through grace, we already share in the divine promise of eternal life.According to the 1962 Missal of Bl. John XXIII the Extraordinary Form of the Roman Rite, in addition to the Feast of the Transfiguration; today is also the feast Sts. Sixtus II and Felicissimus & Agapitus who were martyred during the persecution of Valerian.
Our divine Redeemer, being in Galilee about a year before His sacred Passion, took with him St. Peter and the two sons of Zebedee, Sts. James and John, and led them to a retired mountain. Tradition assures us that this was Mount Thabor, which is exceedingly high and beautiful, and was anciently covered with green trees and shrubs, and was very fruitful. It rises something like a sugar-loaf, in a vast plain in the middle of Galilee. This was the place in which the Man-God appeared in His glory.
Excerpted from Butler's Lives of the Saints, Benziger Bros. ed. 
In the Transfiguration Christ enjoyed for a short while that glorified state which was to be permanently His after His Resurrection on Easter Sunday. The splendor of His inward Divinity and of the Beatific Vision of His soul overflowed on His body, and permeated His garments so that Christ stood before Peter, James, and John in a snow-white brightness. The purpose of the Transfiguration was to encourage and strengthen the Apostles who were depressed by their Master's prediction of His own Passion and Death. The Apostles were made to understand that His redeeming work has two phases: The Cross, and glory—that we shall be glorified with Him only if we first suffer with Him. — Rt. Rev. Msgr. Rudolph G. Bandas
Sts. Sixtus II & Felicissimus & Agapitus
The Martyrs Archdeacon Laurence, Pope Sixtus, Deacons Felicissimus and Agapitus, the Soldier Romanus were citizens of Rome, and suffered in the year 258 under the emperor Valerian (253-259). Holy Pope Sixtus, born at Athens, received a fine education, preached in Spain and was made bishop in Rome following the martyr's death of Holy Pope Stephen. These were times when a pope occupying the Roman throne, was known to choose death for the faith. In a short while St Sixtus also was arrested and put in prison together with his deacons Felicissimus and Agapitus.
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