St. Michael the Archangel

St. Michael the Archangel
(Hebrew "Who is like God?").

St. Michael is one of the principal angels; his name was the war-cry of the good angels in the battle fought in heaven against the enemy and his followers. Four times his name is recorded in Scripture:
http://www.newadvent.org/cathen/10275b.htm

St. Michael, the Archangel - Feast day - September 29th The name Michael signifies "Who is like to God?" and was the warcry of the good angels in the battle fought in heaven against satan and his followers. Holy Scripture describes St. Michael as "one of the chief princes," and leader of the forces of heaven in their triumph over the powers of hell. He has been especially honored and invoked as patron and protector by the Church from the time of the Apostles. Although he is always called "the Archangel," the Greek Fathers and many others place him over all the angels - as Prince of the Seraphim. St. Michael is the patron of and sickness.