Question: Iwan Rheon portrayed Ramsay Bolton on the television program based on the books by whom?
Context: The British Channel 4 science fiction comedy-drama "Misfits" features a number of fictional characters.  The main cast comprises five characters, while a number of additional characters support the show.  The main cast originally consisted of Alisha Daniels (Antonia Thomas), Curtis Donovan (Nathan Stewart-Jarrett), Kelly Bailey (Lauren Socha), Nathan Young (Robert Sheehan), and Simon Bellamy (Iwan Rheon).  After Sheenan (Nathan) left the role Rudy Wade (Joseph Gilgun) was introduced.  Rheon (Simon) and Thomas (Alisha) departed their roles at the end of series 3.  Seth (Matthew McNulty) is initially introduced as a guest character but later begins appearing in a recurring role.  Jess (Karla Crome) and Finn (Nathan McMullen) join the cast in a main role at the beginning of series four.  Supporting characters introduced have included Sally (Alex Reid), Pete (Michael Obiora), Superhoodie, Nikki (Ruth Negga), Shaun (Craig Parkinson) and Greg (Shaun Dooley). Simon Bellamy is a fictional character from the British Channel 4 science fiction comedy-drama "Misfits", portrayed by Iwan Rheon.  Simon was sentenced to community service for attempted arson which leads to him gaining the power of invisibility, reflective of his personality in that he often feels ignored.  Simon has been involved in a storyline which saw him manipulated by his probation worker who he murders.  In the third series finale Simon travels to the past and Rheon later confirmed that he would not be returning for the fourth series. Riviera is a British television drama created by Neil Jordan and co-written by Jordan and John Banville.  It premiered on Sky Atlantic on 15 June 2017.  The ten-part series stars Julia Stiles, Lena Olin, Adrian Lester, Iwan Rheon, Dimitri Leonidas and Roxane Duran. 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". Iwan Rheon (] ; born 13 May 1985) is a Welsh actor, singer, and musician.  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".  He has also been cast as Maximus in the Marvel Cinematic Universe series "Inhumans". "Behold... The Inhumans" and "Those Who Would Destroy Us" are the first and second episodes, and two-part series premiere, of the American television series "Inhumans", initially released together as an IMAX film marketed as Inhumans: The First Chapter.  Based on the Marvel Comics race of the same name, the episodes revolve around Black Bolt and other members of the Inhuman Royal Family, and are set in the Marvel Cinematic Universe (MCU), sharing continuity with the films and other television series of the franchise.  The episodes were written by Scott Buck and directed by Roel Reiné, with series regulars Anson Mount, Serinda Swan, Ken Leung, Eme Ikwuakor, Isabelle Cornish, Ellen Woglom, and Iwan Rheon starring.  The episodes see the Inhuman Royal Family exiled to Hawaii after a coup by Maximus. Jess is a fictional character from the British Channel 4 science fiction comedy-drama "Misfits", portrayed by Karla Crome.  Jess was created to replace Antonia Thomas and Iwan Rheon, who played Alisha Daniels and Simon Bellamy, after they departed the show.  Jess began appearing from series 4 episode 1, in which she was introduced alongside Finn (Nathan McMullen).  Jess has the power of X-ray vision, which is down to her ability to "see through people and their bullshit".  Jess is described as "the person who will say the un-sayable, the person who’ll question social norms and etiquette".  Neela Debnath of the "The Independent" said that "Jess comes across as the more likeable and ‘conventional’ social miscreant" out of the new introductions of the show.  Morgan Jeffrey of Digital Spy felt Crome made "a strong first impression" while Jordan Farley of "SFX" said Jess has her "moments to shine" but that she "fails to make a big impression".  Writing for MSN, Simon Cocks said Jess and Finn "fit into the dynamic perfectly". Alisha Daniels is a fictional character from the British Channel 4 science fiction comedy-drama "Misfits", portrayed by Antonia Thomas.  Alisha gains an ASBO for repeated drink-driving which leads to her receiving community service, where she is involved in a freak storm giving her the ability to make those who make bare contact with her skin go into a sexual frenzy towards her.  She has also been involved in a relationship with fellow youth offender Curtis Donovan (Nathan Stewart-Jarrett) and later Simon Bellamy (Iwan Rheon).  In the Series 3 finale Alisha is killed by Rachel (Jessica Brown Findlay) and Thomas later confirmed her exit from the series. Dinard is the debut studio album released by Welsh actor, singer, and musician Iwan Rheon on April 20, 2015. Finn Samson is a fictional character from the British Channel 4 science fiction comedy-drama "Misfits", portrayed by Nathan McMullen.  Finn was created to replace Antonia Thomas and Iwan Rheon, who played Alisha Daniels and Simon Bellamy, after they departed the show.  Finn began appearing from series 4 episode 1, in which he was introduced alongside Jess (Karla Crome).  McMullen was cast in the role after having previously auditioned for a smaller role but after impressing producer he was asked to play the regular role of Finn.  Finn is described as having a "childlike naively optimistic view of life" and as someone who "talks a lot and often uses this to try and talk himself out of difficult or awkward situations".  Finn has the power of telekinesis, "but he doesn’t really know how to use it".  Writing for "The Independent", Neela Debanth said she finds Jess more likeable than Finn although "there is more to Finn on closer inspection".  Morgan Jeffrey of Digital Spy said that McMullen "makes a strong first impression" while Jordan Farley of "SFX" said Finn has his "moments to shine" but that he ultimately "fails to make a big impression".  Simon Cocks, writing for MSN, said Finn and Jess "fit into the dynamic perfectly".
Answer: George R. R. Martin