Angels are messengers from God that frequently appear in Sacred Scripture. However, only Michael, Gabriel, and Raphael are referred to by name.
Michael is seen in Daniel's visions as "The Great Prince" who defends Israel against its enemies. In the Book of Revelation, Michael leads God's armies to final victory over evil. Devotion to Michael is the oldest angelic devotion, finding its origin in the East during the fourth century. The Church in the West began to celebrate a feast honoring Michael and the angels during the fifth century.
Gabriel is also seen in Daniel's visions. Gabriel announces Michael's role in God's plan. Of course, he is best known for his encounter with Mary, who agrees to bear the Messiah.
Raphael's activity is found only in the Old Testament story of Tobit. He guides Tobit's son Tobiah through a series of phenomenal experiences, which lead to a threefold joyous ending: Tobiah's marriage to Sarah, the healing of Tobit's blindness, and the restoration of their family's fortune.+