Which fictional author wrote Quidditch Through the Ages in J.K. Rowling’s Harry Potter universe?

Kennilworthy Whisp is the fictional author of Quidditch Through the Ages in J.K. Rowling’s Harry Potter universe.

The book is presented as a Hogwarts library volume covering the history and rules of the wizarding sport. Its fictional author, Kennilworthy Whisp, is described as a Quidditch enthusiast and expert. The text gives the magical game an invented scholarly history, including information about broomsticks, playing grounds, fouls, and famous teams.

Rowling published a real charity edition of Quidditch Through the Ages in 2001. It was paired with Fantastic Beasts and Where to Find Them, and proceeds supported Comic Relief. The real edition reproduces the in-universe book as a fictional reference work.

Kennilworthy Whisp is sometimes confused with Bathilda Bagshot, whose fictional history book A History of Magic is cited in the series. Whisp is specifically associated with Quidditch, while Bagshot is associated with wizarding history.