Iwan Rheon portrayed Ramsay Bolton on the television program based on the books by whom?
Iwan Rheon:  He is known for his portrayals of Ash Weston in the ITV sitcom "Vicious", Simon Bellamy in the E4 series "Misfits", and Ramsay Bolton in the HBO series "Game of Thrones". Ramsay Bolton: Ramsay Bolton, formerly known as Ramsay Snow, is a fictional character in the "A Song of Ice and Fire" series of fantasy novels by American author George R. R. Martin, and its television adaptation "Game of Thrones".
George R. R. Martin