In Christianity, the Archangel Michael is the greatest of all the Archangels and is honored for defeating Lucifer in the war in heaven. He is one of the principal angelic warriors, seen as a protector against the dark of night, and the administrator of cosmic intelligence. Michaelmas has also delineated time and seasons for secular purposes as well, particularly in the United Kingdom and Ireland as one of the quarter days.
The Eastern Orthodox Churches do not observe Michaelmas. The Greek Orthodox honor the archangels on the 8th of November instead.
St. Michael is an archangel whose gentle influence is present throughout several religions and spiritual practices. He is often seen as both a great military force and a healer. For many, he has become a symbol not just of strength and protection, but of humility as well.
St. Michael is available over at my CafePress Shop under the Digital Art, Fine Art & Photography section.