Which fictional writer is credited as the author of Quidditch Through the Ages?

Kennilworthy Whisp is the fictional writer credited as the author of Quidditch Through the Ages. The book appears in the Harry Potter world as a reference work about the history and rules of the wizarding sport.

J.K. Rowling published Quidditch Through the Ages in 2001 as a companion volume to the main series. It is presented as a Hogwarts library book borrowed by Harry, and its fictional ownership markings help make the real-world edition resemble an artifact from the novels.

The text describes the development of Quidditch, including the evolution of broom-based games, the introduction of the Golden Snitch, and the roles of the Quaffle, Bludgers, and goal hoops. Whisp’s voice is used to give the invented history the style of a sports reference book.

The book is sometimes confused with Fantastic Beasts and Where to Find Them, another 2001 companion volume. That work is credited in-universe to Newt Scamander, while Quidditch Through the Ages belongs to Whisp.