House Cerwyn of Cerwyn is a noble house from the north. They are one of the closest bannermen to the Starks, Castle Cerwyn being just a half day's ride from Winterfell, and are among the most powerful as well.
Their blazon is a black battle-axe on silver. Their words are, 'Honed and Ready'
With the death of Donnor Cerwyn. His son Eyron Cerwyn is the current lord.