Planets with noble houses?

[Uriel]

So Uriel needs a new... thing. Because space marines on their own are boring. I've put some thought into it and I feel that trying to find his way into a noble house of some sort would be fun - political intrigue, fighting for a liege-lord, what have you. Problem is, I don't know what you crazy kids have done in the year I've been gone and what you all have scribbled. (Knowing you, it's dongs on sleeping peoples' faces.)

So - what planets left/sitting around have noble Houses? I think Ession does, but beyond that, I'm not sure.