Manuscript illumination from the famous Book of Hours, the Très Riches Heures du duc de Berry (1411–1416). God on his throne is surrounded by the Seraphs. Satan / Lucifer and the rebel angels fall into Hell, and fought off by Michael and his angels (depicted as knights).
Navigatio Brendani 11.17:
Nōs sumus dē illā magnā ruīnā antīquī hostis