Which Hogwarts founder created Ravenclaw house in J.K. Rowling’s books?

Rowena Ravenclaw created Ravenclaw house in J.K. Rowling’s Harry Potter books.

Ravenclaw was founded by Rowena Ravenclaw, one of the four medieval founders of Hogwarts School of Witchcraft and Wizardry. The house traditionally values intelligence, learning, creativity, and wit. Its emblem is the eagle, and its colors are blue and bronze in the books.

Rowena Ravenclaw’s daughter, Helena, became the Grey Lady, Ravenclaw’s house ghost. Helena stole her mother’s diadem, a legendary object said to enhance wisdom; Lord Voldemort later turned the diadem into a Horcrux.

The founders are easy to mix up because each name is connected to a house with a similar name. Godric founded Gryffindor, Helga founded Hufflepuff, and Salazar founded Slytherin. Rowena is the founder specifically associated with Ravenclaw.