Castle chapels were usually consecrated to saints, especially those associated with knighthood, such as Saint George or Saint Gereon.
Later medieval legends increased the number of Gereon's companions to 290 or 319, and Saint Norbert of Xanten is said to have discovered, through a vision, the spot at Cologne where the relics of Saint Ursula and her companions, of Saint Gereon, and of other martyrs lay hidden.