We've been reading several books about what it was like to be a knight and live in medieval times. We've also been watching movies like "A Kid in King Arthur's Court" not for any kind of historical reality, but just for fun and to see some knight costumes and jousts. One book we've recently read is You Wouldn't Want to be a Medieval Knight which talks about how hard it was from being sent away from your parents at the age of 7 or 8 and then all the difficulties along the way. The girls liked the comic book look of it.
Another book series that our kids really like is the Sir Cumference books. They are all about a knight named Sir Cumference and his mathmatically named family that help solve the King's math dilemas. So far we've read the Sword in the Cone which is about shapes and the one where Sir Cumference helps King Arthur design the round table after several other unsuccessful shapes are tried.