Where did the Blackfish go after escaping Riverrun?

You mean in the Books, right? 'Cause in the show he's dead. But in the Books, his fate is unknown, but we can hazard a guess. What would an old stubborn man do if he was robbed of his house? Probably he's off to find his kin. read more

He didn’t escape Riverrun, he escaped the red wedding and fled to Riverrun recapturing the castle from the Freys. and met his demise when Jamie lanister road north to retake the castle as per their alliance with Freys for their red wedding insident. read more

Ser Brynden Tully, popularly called "the Blackfish," was a knight and a member of House Tully. He was the younger brother of Lord Hoster Tully, and the uncle of Catelyn, Lysa, and Edmure Tully. read more