catelyn knew them all : the blackwoods and the brackens , ever enemies , whose quarrels her father was obliged to settle ; lady whent , last of her line , who dwelt with her ghosts in the cavernous vaults of harrenhal ; irascible lord frey , who had outlived seven wives and filled his twin castles with children , grandchildren , and great-grandchildren , and bastards and grandbastards as well .