Is Game of Thrones based on books?

Related questions

1. What time period is Game of Thrones?
2. Where is winterfell shot?
3. How much money does Game of Thrones cost?
4. How far is Winterfell to King's Landing?
5. Why did Game of Thrones get Cancelled?
6. Why are they ending game of thrones?
7. Is Game of Thrones a real story?
8. What country is Game of Thrones from?
9. Where do they film Castle Black?
10. How rich is George RR Martin?

Tags

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2. #fifth
3. #series
4. #wrote
5. #comprise
6. #stuck
7. #books
8. #those
9. #mostly
10. #season
11. #allegedly
12. #sixth
13. #george
14. #words
15. #which
16. #martin
17. #thrones
18. #presumably
19. #written