Hogwarts Founders: Intro to the Legendary Chamber of Secrets

“You all know, of course, that Hogwarts was founded over a thousand years ago–the precise date is uncertain–by the four greatest witches and wizards of the age.  The four school Houses are named after them: Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin.”

— Professor Binns setting the groundwork for the "myth" of the Chamber of Secrets (CS9: The Writing on the Wall)