Which fictional author wrote Quidditch Through the Ages in J. K. Rowling’s wizarding world?

Kennilworthy Whisp is the fictional author of Quidditch Through the Ages in J. K. Rowling’s wizarding world.

Rowling presented Quidditch Through the Ages as a reference book written by Whisp. The companion volume describes the history, rules, teams, and equipment of the wizarding sport played at Hogwarts and elsewhere. It was published in the real world in 2001 as a charity edition.

The book’s fictional authorship is a deliberate part of the joke and the world-building. The cover identifies Kennilworthy Whisp, while the real publication credits J. K. Rowling under the wider Harry Potter project.

Readers sometimes confuse Whisp with Newt Scamander, the supposed author of Fantastic Beasts and Where to Find Them, or Bathilda Bagshot, the historian associated with A History of Magic. Each name belongs to a different fictional book.