Any ideas about this 5-page paper I'm supposed to have done by next Friday?

Yeah, I’m supposed to work over Thanksgiving break and write a paper.
It’s supposed to be on something from the Middle Ages. I’m thinking about the chivalry, the knights, the vassals, the lords, the whole way of life around a castle. I’m thinking about just sort of giving a “tour around the castle” on a normal day. Any good books that I could get or sites to look at? Thanks!