That was
Courtnay Penrose, SS, and I believe he met his end in Book 2 (which I don't really consider a spoiler since you meet him in order for him to die).
Alright so it seems they're both the ruling houses. I guess the Iron Islands don't count as a Kingdom. A little weird, but whatever. I wonder who rules them (as much as you can). Also, the Wiki i'm reading notes that Dragonstone is actually in Blackwater Bay (never knew that) so I guess it just reports to the king, though would have no other lands to rule over.