http://tvtropes.org/pmwiki/pmwiki.php/Literature/TheWorldOfIceAndFire

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The World of Ice & Fire: The Untold History of Westeros and the Game of Thrones is an encyclopedia for George R. R. Martin's epic fantasy series A Song of Ice and Fire, co-written by Martin and Elio Garcia, Jr. and Linda Antonsson, administrators of the popular fansite Westeros.org.

The book is written as a comprehensive history from the in-universe perspective of one Maester Yandel. As such, the book represents Westeros's knowledge on its own universe, leading to, for example, Yandel dismissing certain magical events out of hand or entertaining false theories, when any real-world reader of the main book series would know better. Additionally, Yandel began the book in the ninth year of Robert's reign but didn't finish until the beginning of Tommen's, meaning that, for the most part, the book represents Westeros as it was before A Game of Thrones, the first book in the main series.

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The World of Ice & Fire provides examples of: