question: Who is the writer of the series of fantasy novels of which the television series in which Ralph Ineson plays Dagmer Cleftjaw is an adaptation?
answer: George R. R. Martin
context: Title: Game of Thrones
  Passage: Game of Thrones is an American fantasy drama television series created by David Benioff and D. B. Weiss.  It is an adaptation of "A Song of Ice and Fire", George R. R. Martin's series of fantasy novels, the first of which is "A Game of Thrones".  It is filmed in Belfast and elsewhere in the United Kingdom, Canada, Croatia, Iceland, Malta, Morocco, Spain, and the United States.  The series premiered on HBO in the United States on April 17, 2011, and its seventh season ended on August 27, 2017.  The series will conclude with its eighth season in 2018 or 2019.
  Title: Lisa Mantchev
  Passage: Lisa Mantchev is an American author of fantasy novels and short stories.  She is best known for her Théâtre Illuminata series, a trilogy of young adult fantasy novels.
  Title: Ralph Ineson
  Passage: Ralph Michael Ineson (born December 15, 1969) is an English actor, best known as Dagmer Cleftjaw in "Game of Thrones", Amycus Carrow in the last three "Harry Potter" films, William in "The Witch" and Chris Finch in the BBC series "The Office".
  Title: Caroline Stevermer
  Passage: Caroline Stevermer (born 1955) is a writer of young adult fantasy novels and shorter works.  She is best known for historical fantasy novels.
citations: Ralph Ineson Game of Thrones