In the Harry Potter books there are 4 houses at Hogwarts School. Three of them are Gryffendor, Ravenclaw and Slytherin. Name the fourth.
The Chamber of Secrets Hogwarts quidditch teams N.E.W.T. Hogwarts School of Witchcraft and Wizardry Hogwart's House System Hogwarts House Points Hogwart's School of Witchcraft And Wizardry The Hogwarts Express Hogwarts School NEWTS Howgarts O.W.L. Hogwarts School of Witchcraft and Wizardery Chamber of the Silent Hogwarts School for Witchcraft and Wizardry Hogwarts Castle Ravenclaw Chamber of Secrets Gryffindor Hufflepuff Locations in Hogwarts Founders of Hogwarts O.W.L.s Hogwarts NEWT Hogwarts layout Chamber of secrets Hogwarts houses Battle of hogwarts Griphindor Slitherin Ordinary Wizarding Levels Owlery Hogwarts High School Ordinary Wizarding Level Hogwarts School Of Witchcraft And Wizardry Nastily Exhausting Wizarding Test The chamber of secrets Rowana ravenclaw Hogwarts Floor Directory Hogwarts Houses Hogwards List of Hogwarts Quidditch Teams Hogwarts Express Griffindor Hogwart's Room of Requirement Slytherin Hogwarts castle