Catelyn Stark's family, House Tully, has a leaping fish as its symbol. So when her no-nonsense uncle Brynden had a falling out with her powerful father, instead of being the Tully family's black sheep, he declared himself its Blackfish. Self-imposed exile hasn't stopped him from becoming one of Westeros's deadliest warriors, though, so he'll be integral to his great-nephew Robb's plans for victory.