Luke Roberts (born 1977) is an English actor. He is best known for his role as Joseph Byrne in the television series Holby City. He has also appeared in films such as Pirates of the Caribbean: On Stranger Tides (with Ian McShane, DeObia Oparei and Anton Lesser) and 300: Rise of an Empire and television series such as Band of Brothers, Crossroads, Mile High, Law & Order: UK, Beauty & the Beast, Reign and Wolf Hall. He also plays an important role in Black Sails season 3. In Game of Thrones, he played Ser Arthur Dayne in the sixth season episode "Oathbreaker".