Game of Thrones was created for HBO 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 titled A Game of Thrones.
The series, set in the fictional continents of Westeros and Essos at the end of a decade-long summer, interweaves the members of several noble houses in a civil war for the Iron Throne of the Seven Kingdoms, the rising threat of the impending winter and the mythical creatures of the North, and the attempts of the exiled remaining members of the royal family that once ruled Westeros to reclaim the throne.
HBO Official Site http://www.hbo.com/game-of-thrones/index.html
Houses & Family Trees http://towerofthehand.com/books/houses.html