I am Gabriel. The meaning of the name Gabriel is "Hero of God," or "Mighty One of God." In the canonical books only two of the heavenly ones are mentioned by name. Gabriel (here and Daniel 8:16 and Daniel 9:21) and Michael, which signifies "Who is like God" (Jud Luke 1:9; Revelation 12:7; and in Daniel 10:13, Daniel 10:21; Daniel 12:1). Of these two blessed spirits whose names are revealed to us in the Word of God, their appointed work seems to be in connection with the human race and its enemies. Gabriel is the special messenger of good news. He comes to Daniel, and tells him of the restoration of Jerusalem; to Zacharias, and announces the birth of his son, and declares what his glorious office would consist in; to Mary of Nazareth, and foretells the nativity. Michael, on the other hand, appears as the warrior of God. In the Book of Daniel he wars with the enemies of the people of the Lord; in Jude and in the Revelation of St. John he is the victorious antagonist of Satan the enemy of the Eternal. The Jews have a striking saying that Gabriel flies with two wings, but Michael with only one; so God is swift in sending angels of peace and of joy, of which blessed company the archangel Gabriel is the representative, while the messengers of his wrath and punishment, among whom Michael holds a chief place, come slowly. That stand in the presence of God.
"One of the seven
Who in God's presence, nearest to his throne,
Stand ready at command, and are his eyes
That run through all the heavens, and down to the earth
Bear his swift commands, over moist and dry,
O'er sea and land."
Milton derived his knowledge of the seven from the apocryphal Book of Tobit, where in chapter 12:15 we read, "I am Raphael, one of the seven holy angels, which present the prayers of the saints, and which go in and out before the glory of the Holy One." In the very ancient Book of Enoch we read of the names of the four great archangels, Michael, Gabriel, Uriel, and Raphael.