How we cite our quotes:
"We must," said Peter. "Cheer up, Susan. It's no good behaving like kids now that we are back in Narnia. You're a Queen here. And anyway no one could go to sleep with a mystery like this on their minds." (2.56)
The "You're a Queen here" line has a major undertone of chivalry to it. Susan, as a queen, has certain standards set upon how she should act based on her class and status. Why a queen should have to enter the treasure chamber of a ruined castle in the middle of the night is beyond us, though. Don't they know what kinds of beasties tend to lurk in such places?
"Are you going to tell me what you wouldn't tell me the other day?" said Caspian.
"I am," said the Doctor. "But remember. You and I must never talk about these things except here—on the very top of the Great Tower." (4.50-51)
This scene really captures Caspian's existence as both an Old Narnian and New Narnian. But despite existing in both worlds, the doctor's lessons provide Caspian with a code of conduct based in Old Narnia chivalry (as we'll see later on).
[Caspian] also began to see that Narnia was an unhappy country. The taxes were high and the laws were stern and Miraz was a cruel man. (5.2)
Miraz is definitely lacking in the chivalry department. As the villain most villainous, he doesn't care for others, and that makes him a jerk, not a knight.