a worldbuilding question about house justman. What would you name their fortress/seat, its corresponsing city(if the castle has one) and where would you place it/them? around the place where the trident forks or where harrenhall was build seems like the two best possible places.

Good question! 

As discussed here, I would guess based on the story that the Justman seat and lands would be on the Red Fork between Stone Hedge and Raventree Hall, both because Benedict Justman’s support was initially from the houses of his mother and father, and because putting himself physically in between the Brackens and Blackwoods is probably the only way to keep them from fighting. 

So I would imagine that the castle proper is on an island in the middle of the river overlooking a major ford over the Red Fork, but also controls lands on both banks. As for the name, I kind of like Scales – it follows from House Justman’s sigil, but it also works to allude to the fishes in the Red Fork and that general Trident vibe.