Mary was born to be the mother of the Savior of the world, the spiritual mother of all men, and the holiest of God's creatures. Because of her Son's infinite merits, she was conceived and born immaculate and full of grace. Through her, Queen of heaven and of earth, all grace is given to men. Through her, by the will of the Trinity, the unbelieving receive the gift of faith; the afflicted are tendered the works of mercy; and the members of Christ grow in likeness of their Head. In Mary all human nature is exalted. We rejoice in her birthday, as the Church has done from the earliest times. This is one of the three birthdays in the Church Calendar — the Birth of Jesus (December 25), the Birth of John the Baptist (June 24) and the Birthday of Mary. All three were born without original sin, although Mary and Jesus were conceived without sin, and St. John was cleansed of original sin while in the womb at the Visitation of Mary.
According to the 1962 Missal of Bl. John XXIII Extraordinary Form of the Roman Rite, today also commemorates St. Adrian. The liturgy of Our Lady's Birthday in Rome included a procession from the church of St. Adrian in the forum. St. Adrian was a Herculian Guard of the Roman Emperor Galerius Maximian. After becoming a convert to Christianity with his wife Natalia, Adrian was martyred at Nicomedia on March 4, 306.
Historically it is the feast of St. Corbinian, a Frank who spent fourteen years as a hermit and then went to Rome, where Pope Gregory II consecrated him bishop and sent him to evangelize Germany.