The aged Lord of the Crossing, Walder Frey oversees his massive brood—it’s a common jest that he can field an army out of his pants—and the chief crossing of the Green Fork that they control. Ninety-one years old, he has had many wives, many legitimate children, and not a few illegitimate ones… and as of the first novel, he has a new, young bride whom he is eager to get more children one despite his growing infirmity. He is also called the Late Lord Frey, for his late appearance at the Battle of the Trident after all the fighting was done. Lord Walder is a venal, suspicious, and ambitious man.
The actor cast in the role is almost twenty-five years younger than the character as described in the novels, which raises the question as to whether they will youthen old Lord Walder or, alternatively, use performance and make-up to make him seem older than his true age.
Outraged to learn that Robb has wed Talisa Maegyr, the Freys withdraw their support for a time, but eventually Lord Walder sends two of his sons to negotiate over the matter and are satisfied to have Edmure wed one of Lord Walder’s daughters. Lord Walder hosts the wedding at the Twins, where he also accepts Robb’s heartfelt apology. During the feast, however, the Freys turn on the Starks and murder most of those present, including Robb, Talisa, and Catelyn. Lord Walder is revealed to have plotted with Roose Bolton and Lord Tywin Lannister, wanting revenge for the insult Robb had dealt with him. Lord Walder later learns from Roose that his bastard son, Ramsay, was behind the sacking of Winterfell.