Could be referring to the Crusader Kings 2 mod which gives the Starks Sea Dragon Point and the Stoney Shore due to no houses that have been revealed to own it.
I assumed it was just split between Glover, Tallhart and Dustin. I think that's quite a lot of land for one house to have either way. I've stated in the rules that custom houses are allowed to be only minor lords (Houses under major houses like Reed, Manderly, Bolton, etc.) so that's a bit too much land for a minor lord.
Also I have decided to allow the players from Century to play the houses they had, since there's only about three returning players. (Eraus, Warg and Nux)