A knight was a member of House Frey. He is drinking with companions at the Inn at the Crossroads when Tyrion arrives on his way south. Catelyn, who is also present in the inn, turns to the present knights from the Riverlands to help her to take Tyrion into custody, accusing him of attempting to murder her son Bran. She asserts her origin as a daughter of House Tully, and then tells the knight that she knows his sigil and asks after Lord Walder Frey. He reports that Lord Frey is about to celebrat
Walder Frey, Wiki of Westeros
House Farring, Wiki
Frey (knight), Wiki of Westeros
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