Ser Harrold Westerling is a character from House of the Dragon, an American fantasy drama television series created by George R. R. Martin and Ryan J. Condal for HBO. The character was portrayed by Graham McTavish.
Ser Harrold Westerling is a member of the Kingsguard who has served since King Jaehaerys, he was once a powerful knight. He is tasked with watching over and protecting Princess Rhaenyra.
Set two hundred years before the events of Game of Thrones, the series chronicles the beginning of the end of House Targaryen, the events leading up to the Targaryen civil war, known as the "Dance of the Dragons", and the war itself.