Dolores Umbridge may have looked like an iced cupcake, but she was anything but sweet. She was savage, sadistic and remorseless. When she dared take control of Hogwarts from Albus Dumbledore, she committed all sorts of sinister acts. Under the newly created title of 'High Inquisitor' she single-handedly (well, with a little help from Filch) sucked the beloved school of all its joy, put every student in grave danger, and tortured Harry Potter. As far as we're concerned, she more than deserved her fate at the hands (hooves?) of centaurs

. It was agreed that each would construct their own houses, for example, choosing the location of common rooms and dormitories. However, only Slytherin went further, and built what was in effect a personal, secret headquarters within the school, accessible only by himself or by those he allowed to enter.Perhaps, when he first constructed the Chamber, Slytherin wanted no more than a place in which to instruct his students in spells of which the other three founders may have disapproved (disagreements sprung up early around the teaching of the Dark Arts).