Michael the archangel, whose name in Hebrew means "Who is like God?", is revered as the leader of the angelic army who will conquer Satan and his armies of demons, and is considered the defender of the Church. Michael is more often represented in art thank any other angelic being. He is often shown wearing armor, in the act of slaying the great Dragon of the Apocalypse [Satan] in Revelation 12:7-9.
The archangel Gabriel, whose name in Hebrew means "Strength of God", announced the birth of John the Baptist to Zachariah, and soon after, announced to Mary that she was to become the mother of Our Lord. His address to her, "Hail, full of grace, the Lord is with thee" (the "angelic salutation") is familiar to all who say the Rosary.
The archangel Raphael, whose name means medic or ointment of God, is mentioned by name in the Old Testament book of Tobit (Tobias), whom the angel aided by healing him of blindness and guiding him on his travels.
St. Gregory the Great and the apocryphal book of Enoch list names for the other four archangels, but the information varies among different sources.