A House Divided states:
House Lannister only.
Response: After a player plays a character with a Trait he already has in play, choose and return 1 character with that Trait to the top of its owner's deck.
If my opponent has a location with a "The East" trait but then plays Yezzen's Grotestquerie can I trigger "A House Divided"? Since the card type for a "Trait already in play " is not specified I wouls assume so.