Gryffindor.
Professor Severus Snape Head of Slytherin House Was in Slytherin Potions Master at Hogwarts Played in the films by actor Alan Rickman
It's hard to tell, since we don't actually see him as headmaster and only hear bits of information. Given that the school was under death eater rule, Snape did his best to protect the students as much as he could. Unfortunately, he couldn't stop the Carrow's from torturing students otherwise Voldemort would have questioned his loyalty.
Severus Snape took many points away from Gryffindor throughout the years. He Favorited Slytherin house and had a grudge against Harry's father, so took it out on Harry.
Professor Severus Snape starts out as the Potions master and Head of Slytherin House. Professor Minerva McGonagall is the Transfiguration teacher and Head of Gryffindor House.
Albus Percival Wulfric Brian Dumbledore is the headmaster up until book seven when Severus Snape replaces him. After Snape it is unknown for sure who became headmaster but J.K. Rowling confirmed that McGonagall wasn't Headmistress.
Snape's mother's name was Eileen Prince. She married a muggle who's surname was Snape (we never know his first name), which made Severus a half-blood Prince giving the title of the sixth Harry Potter book.
During the school year, they are at Hogwarts. When school is out, Malfoy lives with his family at Malfoy Manor while Snape lives in a house on Spinner's End.
Aything ranging from Iron Man, Sherlock Holmes, House M.D. and Severus Snape.
Salazar Slytherin was one of the four founders of Hogwarts School of Witchcraft and Wizardry. Voldemort (Tom Marvelo Riddle) was a direct descendent of Slytherin. The other founders are Rowena Ravenclaw, Godric Gryffindor and Helga Hufflepuff.
Mundungus Fletcher in the Half Blood prince and Severus Snape in the Deathly Hallows ( When he steals Lilly's photograph and a piece of her letter).
Gryffindor, much to the dismay of Severus Snape, who at the time of they're arrival at hogwarts, was Lilly Potter's best friend.
Severus Snape was referreeing the match and Harry felt he had to catch the snitch quickly before Snape's biased opinion damaged his house too much.