Was there really an angel Gabriel?
The angels are an important part of modern Jewish tradition, as well as those of Christianity and Islam, with Gabriel having the special role of being the messenger of God.
However, angels only entered Jewish belief in books of the Bible written after the Babylonian Exile, possibly as a result of Zoroastrian influence. If the Israelites had not previously known of angels, it is reasonable to say that angels do not really exist, and therefore the angel Gabriel does not exist.
The first book of the Bible talks about Angels. Or perhaps more appropriatly, "Fallen Angels." Nephilim. This was before the Babylonian Exile. It is not accurate to say that angels are the result of an incorporation of different traditions and beliefs into the Torah.
According to the Catholic, Eastern Orthodoxy, Oriental Orthodoxy, Greek Orthodoxy, and Episcopal traditions the archangel Gabriel did. In some of the other protestant sects, Gabriel is not considered an Archangel so they would say the angel Gabriel did. However; not all Protestant sects name the angel that trumpeted the birth of Jesus. In Islam it is believed that the birth of Jesus is brought by the angel Gabriel or by Gabriel and other angels.
In the Book of Daniel 10: 10-13 we are told that Daniel during a vision is touched by a hand, (presumably the hand of Gabriel the angel as Gabriel is the usual messenger between God and Daniel) and explains to Daniel that he, Gabriel, has been trying to contact Daniel for 21 days, but the prince of the kingdom of Persia (An evil angel) withstood him and that finally Michael (the chief angel of heaven)…