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?
Ralph Ineson: 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". Game of Thrones:  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".
George R. R. Martin