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  === Walder Frey ===
  Walder Frey is Lord of the Twins, and a vassal to House Tully. He is called the Lord of the Crossing as the placement of his castle allows him to control who crosses the river, giving Walder Frey considerable strategic importance. He is known for having over a hundred descendants and taking eight total wives. He emphasizes family loyalty and believes in taking care of relations, including those who disappoint him. Although he is a bannerman of House Tully, he does not immediately go to Riverrun when Edmure Tully summons his vassals to support Robb Stark in ''A Game of Thrones''.
  Since crossing the Twins is a necessity for Robb, Walder is able to negotiate marriage contracts between his house and House Stark. But when Robb marries Jeyne Westerling in ''A Clash of Kings'', Frey is outraged and withdraws his support from Robb to conspire with Tywin Lannister and Roose Bolton to enact his revenge. In ''A Storm of Swords'', Walder pretends to make amends with Robb and agrees to marry his daughter Roslin to Edmure. The wedding is a trap, with Robb, his key supporters, and most of his army massacred during the feast, a direct violation of ancient guest right customs. He then openly swears loyalty to House Lannister and his second son Emmon Frey receives Riverrun, the seat of House Tully, as a reward, with advantageous marriages for other descendants of his. However, the people of the Riverlands refuse to support his rule, and a shadowy guerrilla war erupts that Walder Frey struggles to control. House Frey is so large and factional that many of the Freys hate each other, aspiring to become Lord of the Crossing themselves.
  In the HBO television adaptation, he is portrayed by David Bradley.