Q: In this task, you are given a context paragraph, a question based on that and corresponding answer of a question. Your task is to generate supporting fact/knowledge from context paragraph which helps in answering a given question.
Gregor Clegane, nicknamed "The Mountain That Rides" or simply "The Mountain", 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". In the books, the character is initially introduced in 1996's "A Game of Thrones". He subsequently appeared in "A Clash of Kings" (1998), "A Storm of Swords" (2000) and in "A Dance with Dragons" (2011). Question: Hafor Julius Bjornsson plays an HBO character who first appears in book form in what year? Answer: 1996
A:
In the books, the character is initially introduced in 1996s A Game of Thrones.