Quidditch Through the Ages is a 2001 book written by British author J. K. Rowling using the pseudonym of Kennilworthy Whisp about Quidditch in the Harry Potter universe. It purports to be the Hogwarts library's copy of the non-fiction book of the same name mentioned in several novels of the Harry Potter series.
The book benefits the charity Comic Relief. Over 80% of the cover price of each book sold goes directly to poor children in various places around the world. According to Comic Relief, sales from this book and its companion Fantastic Beasts and Where to Find Them have raised £17 million.
In 2001, Rowling penned two companion books to the Harry Potter series, Quidditch Through the Ages and Fantastic Beasts and Where to Find Them, for British charity and offshoot of Live Aid, Comic Relief with all of her royalties going to the charity. As of July 2008, the books combined are estimated to have earned over $30 million for Comic Relief. The two books have since been made available in hardcover.