Books
A Song of Ice and Fire
Fandom for George R. R. Martin's ongoing A Song of Ice and Fire novel series, begun in 1996.
Harry Potter (book series)
Fandom for the Harry Potter book series by J. K. Rowling.
Tales of Dunk and Egg
Fandom for George R. R. Martin's Tales of Dunk and Egg novellas, set roughly 90 years before A Song of Ice and Fire -- the first three are compiled as the book A Knight of the Seven Kingdoms.