The Complete Guide to All 21 Major Houses on Game of Thrones

Location: The Riverlands
Sigil: Two stone gray towers and bridge on a dark gray background with blue water
Major members:

• Lord Walder Frey, former head of House Frey — Deceased

Why They Matter:
The Red Wedding, brought to you by the Lannisters via Walder Frey, feat. Roose Bolton. Both the Freys and Boltons were promised rewards by the Lannisters if they helped carry out the murder of Robb Stark, which would essentially secure a Lannister victory. And none of us will ever get over it.

Since the Red Wedding, the Freys were the dominant house in the Riverlands, especially with Edmure Tully as their prisoner. However, Arya finally makes it back to Westeros in season six, and she gets her revenge by feeding Walder a couple of sons and then cutting his throat.