|Jaime Huguet, 1456|
Instead of retaining separate feasts for each of the Archangels mentioned in the Bible, it groups them all together.
In the older forms of the calendar though, it is the feast of the Dedication of the Basilica of St Michael the Archangel, as the martyrology explains:
"On Mount Gargano, the commemoration of the blessed Archangel Michael. This festival is kept in memory of the day, when under his invocation, was consecrated a church, unpretending in its exterior, but endowed with virtue celestial."