Gabriel in the Old Testament
Mary's angel Gabriel is also the angel who appeared to Daniel in the Old Testament (cf. Daniel 8,9)
Gabriel in the Hail Mary
It is also worth noting that the archangel Gabriel's words to Mary form the beginning of the Hail Mary prayer:
Haile thou that art highly favored, the Lord is with thee: Blessed art thou among women. Luke 1:28 KJV
In the Hail Mary, Elizabeth's greeting then complements Gabriel's greeting, i.e.
Blessed art thou among women, and blessed is the fruite of thy wombe. Luke 1:42 KJV
Gabriel's Feast Day
The feast day of Gabriel, along with Raphael and Michael (the only other angels identified by name in Scripture), is celebrated on September 29th, commonly referred to as Michaelmas Day. (cf. Thurston & Attwater 1956, p.677)
REFERENCES
The Bible Museum. The Bible: 1611 King James Version: 1st Edition, 1st Printing, (Goodyear, AZ: The Bible Museum, 2006).
Thurston, H. Attwater, D. Butler's Lives of the Saints, Complete Edition, Vol. III, (Notre Dame, IN: Ave Maria Press, Inc., 1956).
The angel Gabriel appeared to Mary in the Bible.
The angel Gabriel appeared to Mary in the biblical story.
The angel that appeared to the Virgin Mary in the Bible was Gabriel.
After the angel appeared to Mary, she visited her relative Elizabeth.
Angel Gabriel
The angel Gabriel appeared to Mary when she was a young woman, announcing that she would give birth to Jesus.
The Feast day when the angel Gabriel appeared to Mary is celebrated on March 25th and is known as the Feast of the Annunciation. This feast commemorates the announcement of the conception of Jesus by the angel Gabriel to the Virgin Mary.
Angel Gabriel told Mary she was going to have a child
The angel Gabriel appeared to Joseph in a dream to tell him about Mary's pregnancy.
Luke 1:26, 27 - Now in the sixth month the angel Gabriel was sent by God to a city of Galilee named Nazareth, to a virgin betrothed to a man whose name was Joseph, of the house of David. The virgin's name was Mary. [NKJV]
Gabriel
Because she supported Him during His Passion.