Roslin is the 19-year-old daughter of Walder Frey, Lord of the Crossing. Unlike the majority of Lord Walder's brood, Roslin is quite beautiful. She was intended to marry King Robb Stark as part of an alliance between her father and him (Walder had given Robb a choice of any one of his many daughters or granddaughters, but Roslin would have been the obvious choice), but Robb fell in love with and married Talisa Maegyr instead.