Archangel. Leader of the army of God during the Lucifer uprising. Considered the guardian angel of Israel, and the guardian and protector of the Church. In the Book of Daniel (12:1), Michael is described as rising up to defend the Church against the Anti-Christ.
The feast of the Apparition of Saint Michael commemorates appearance of the archangel to a man named Gargan in 492 on Mount Gargano in southern Italy. Gargan and others were pasturing cattle on the mountain; a bull wandered off and hid in a cave. An arrow was shot into the cave, but it came flying back out and wounded the archer. The cowherds went to their bishop who ordered three days of fasting and prayer to seek an explanation for the mystery. At the end of the three days Michael appeared to the bishop and requested a church built in the honour of the Holy Angels in the cave. If you find medals or holy cards with 'relics' of Michael, they are probably rock chips from the cave, or pieces of cloth that have touched it.