He is paralleling the existence of Adam and Eve, particularly Adam, and references Lucifer, which was God's most favored angel, until he fell because he had tried to be better than God.
The character in the canterbury tales that would have belonged to the lowest rung in the feudal society of chaucer's time is : C. The miller
In Chaucer;s period, the further you are from the kingdom, the lower your class would be. The miller in that story is the equivalent of a very low class worker of modern times
hope this helps
