Athalos Tyrell is a recurring character of the first and seconds season and a major character of third season through the seventh season of Game of Thrones. He makes his debut in Cripples, Bastards, and Broken Things. Athalos is the youngest child of Mace Tyrell and Alerie Hightower. He is popularly known as the Knight of Thorns for his sharp wit and even sharper tongue much like his grandmother, Olenna.