The Rills are in the hilly country southwest of Torrhen’s Square. Long ago, 79 men deserted the Night’s Watch and sought sanctuary with Lord Ryswell because one of their number was his son. He captured them and returned them where they were executed one and all by being buried alive in the ice at the top of the Wall. In his dying days, Lord Ryswell took the black so that he could stand his watch next to the son that he had loved.
Ser Mark Ryswell was one of Eddard Stark’s companions to the Tower of Joy who died in the fighting there against the three Kingsguard, although he was not the lord of the house at the time.