The Assumption of the Blessed Virgin Mary
Feast: August 15
The Assumption is the oldest feast day of Our Lady, but we don't know how it first came to be celebrated.
Its origin is lost in those days when Jerusalem was restored as a sacred city, at the time of the Roman Emperor Constantine (c. 285-337). One of the memories about Jesus' mother centered around the "Tomb of Mary," close to Mount Zion, where the early Christian community had lived.
On the hill itself was the "Place of Dormition," the spot of Mary's "falling asleep," where she had died. The "Tomb of Mary" was where she was buried.
At this time, the "Memory of Mary" was being celebrated. Later it was to become our feast of the Assumption.
For a time, the "Memory of Mary" was marked only in Palestine, but then it was extended by the emperor to all the churches of the East. In the seventh century, it began to be celebrated in Rome under the title of the "Falling Asleep" ("Dormitio") of the Mother of God.
Soon the name was changed to the "Assumption of Mary," since there was more to the feast than her dying. It also proclaimed that she had been taken up, body and soul, into heaven.
Today, the Benedictine Abbey of the Dormition of Mary stands on the spot of her tomb.
At the Council of Chalcedon in 451, when bishops from throughout the Mediterranean world gathered in Constantinople, Emperor Marcian asked the Patriarch of Jerusalem to bring the relics of Mary to Constantinople to be enshrined in the capitol. The patriarch explained to the emperor that there were no relics of Mary in Jerusalem, that "Mary had died in the presence of the apostles; but her tomb, when opened later . . . was found empty and so the apostles concluded that the body was taken up into heaven."
In the eighth century, St. John Damascene was known for giving sermons at the holy places in Jerusalem. At the Tomb of Mary, he expressed the belief of the Church on the meaning of the feast: "Although the body was duly buried, it did not remain in the state of death, neither was it dissolved by decay. . . . You were transferred to your heavenly home, O Lady, Queen and Mother of God in truth."
The prayer for the feast reads: "All-powerful and ever-living God: You raised the sinless Virgin Mary, mother of your Son, body and soul, to the glory of heaven. May we see heaven as our final goal and come to share her glory. In 1950, in the Apostolic Constitution , Pope Pius XII proclaimed the Assumption of Mary a dogma of the Catholic Church in these words: "The Immaculate Mother of God, the ever-virgin Mary, having completed the course of her earthly life, was assumed body and soul into heaven."
(Edited from: http://www.ewtn.com/saintsHoly/saints/A/assumptionoftheblessedvirginmary.asp