That sounds like the Starks. They were the Wardens of the North for generations, though they fell out of royal favor when the lord of the House, Eddard Stark, was executed for treason and his son went to war against the crown. I'm glad your family have had no such troubles.

A knight of great renown! How extraordinary! And I take it that you were no mere tourney knight, but you actually fought in battles..

[Margaery looks concerned at his change in demeanor]

I'm so sorry. It's terrible to lose a sibling. You have my sympathies. But, the rest of your family sounds impressive.