This window symbolically depicts the sin of the angels, whose seductive voice led our first parents to disobey God. According to the Holy Bible and the christian tradition fallen angel is a devil. He was created as a good angel but then, he rebelled against God. The imagery of the victorius Christ on the horse, thriumphing over fallen angels refers to this apocaliptic vision: "I saw heaven standing open and there before me was a white horse, whose rider is called Faithful and True. With justice he judges and wages war.^" (Revelation 19, 11)