Walder Frey

Lord Walder Frey is a character in Game of Thrones. He is played by David Bradley and debuts in the first season.

Walder Frey is the Lord of the Twins and the head of House Frey, a minor vassal house of the Riverlands sworn to House Tully, noted for its overwhelming fertility.

Cripples, Bastards and Broken Things
Catelyn Stark meets a knight of House Frey at the Crossroads Inn and asks after Lord Walder's health. The knight replies that Lord Walder is hale and is planning to celebrate his 90th birthday by taking a new wife. Tyrion Lannister laughs at this, showing that he does not think much of the Freys.

In the books
In the Song of Ice and Fire novels, Walder Frey, the Lord of the Crossing, is an ancient (over 90), irascible and cranky old lord who rules over a vast brood of children, grandchildren, bastards, nieces and nephews. His house has grown rich by building and maintaining the Twins, two castles that control the only crossing over the Green Fork of the River Trident for hundreds of miles. He is proud and haughty, but also crafty. He is known to his liege lord, Hoster Tully, as the 'Late Lord Frey' after delaying his arrival to assist Robert's Rebellion until the outcome had already been determined.