Human: Why is the book called A Game of Thrones? Assistant: 
The book is called A Game of Thrones because the book is about a game of thrones. The book is about a war between the houses of Stark and Lannister. The war is fought over the throne of the Seven Kingdoms, which is called Westeros. The book is set in a fictional world called Westeros, which is located in the North of the world.