The Hogwarts founders were four witches and wizards who established Hogwarts School of Witchcraft and Wizardry during the medieval era, in the 10th century. These four founders are widely described as being the most brilliant witches and wizards of the time and were the following: Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw and Salazar Slytherin. Each of them created their own House: Gryffindor, Hufflepuff, Ravenclaw and Slytherin respectively. #hp
Headcanon according to Hogwarts Founders' legacies to Hogwarts: Gryffindor - Sorting Hat, Hufflepuff - Room of Requirement, Ravenclaw - The Quill of Acceptance and The Book of Admittance, Slytherin - Chamber of Secrets.