The death of the previous Queen. If he remembered correctly, that had been Christian's aunt. House was about to ask how Christian was doing when he heard what came next. "Does this mean I should be calling you Your Highness now?" He had no doubt that Lissa would be a good Queen. She was good at everything she did, except knowing how to say no when people asked her for help. But even that was admirable.
So Christian wasn't with her. House felt relieved, yet slightly disappointed. Perhaps if he'd stayed in the Valley they may have found a way to be friends again. "I want to hear all about it. Are you hungry? I was going to get something when I saw your post.."