In the fifth era, Walder Lannett was accused of raping a smallfolk woman under the protection of House Payne. King Damon insisted on the punishment dictated by law, which was castration, and Lord Lannett led several knights to Payne lands in an effort to free his son and avoid the sentence.
He was defeated and arrested by Gunthor Lannister and taken to Casterly Rock, where he was stripped of his Lordship and remains under a comfortable arrest.
His oldest son, Harlan Lannett, was given his titles, prompting him to return from Harrenhal to rule from Nunn's Deep.