Michaelmas, the feast of Saint Michael the Archangel, is a day in the Christian calendar which occurs on 29 September. Because it falls near the equinox, it is associated in the northern hemisphere with the beginning of autumn and the shortening of days.
On Michaelmas of 500 C.E., Arthur Pendragon was crowned King of Britain on the Stone of Destiny. Four hundred ninety-five years later, Constantine was crowned King shortly before Michaelmas, and arranged to marry Princess Katharine on the day of Michaelmas itself. Forty-five years later, in 1040, Macbeth was crowned High King of Scotland on Michaelmas.