After Sunderland's Folly, the Three Sisters became a part of the North. Houses Borrell, Longthrope, and Torrent were quick to surrender and swear fealty to House Stark. Jon Stark let them choose - marry into the North and foster all their children with Northern Houses for five generations or exile, and all chose the former. Redcliff Castle, the seat of House Sunderland, was pulled apart stone by stone, and Icewatch was built on a nearby rocky hill instead. King Jon Stark decreed that Icewatch would be ruled by a steward appointed by the Northern Crown, a position that was not hereditary, just like the Protector of the Moat.