Damon Lannister

Damon Lannister is an unseen character in Game of Thrones. He is long deceased before the start of the series. He once was the Lord of Casterly Rock and an ancestor to House Lannister.

Season 4
He is mentioned in the entry of Ser Duncan the Tall, as recorded in the Book of Brothers. Duncan once saved his daughter from the clutches of Ironborn raiders, who had taken her as a hostage.

In the Books
In the books Lord Damon is a renowned Tourney knight, even when ruling as Lord of Casterly Rock. He died during the Great Spring Sickness, an epidemic that swept the Seven Kingdoms during the reign of King Daeron II Targaryen.