Slytherin House was founded by and named after Salazar Slytherin.
Salazar Slytherin left Hogwarts when he got into an argument
with Godric Gryffindor because Salazar wanted  only pure blood witches
and wizards into the school.

Here you are in Slytherin,
Where you'll make your real friends,
Those cunning folk use any means
To achieve their ends.

House Symbol
The Snake was chosen as a symbol because Salazar Slytherin had the gift of Parseltongue, enabling him to talk to snakes.  Thomas Riddle (Voldermot) also had this talent. 

House Banner
Slytherin House Banner
The house banner is hung in the great hall for 1 year.  The house winning the house cup each  year has their banners hung for the following year.  Slytherin won the house cup for 7 consecutive years.
Head of House
Professor Severus Snape
Professor Snape is the potions instructor and the teacher in charge of the students of Slytherin House.  He favours students of his own house while being antagonistic to  the students from Gryffindor. 
House Ghost
The Bloody Baron
The Bloody Baron is a grim, silent, terrifying fellow who is covered with bloodstains of unknown origin.   Peeves, who respects the Baron for some unknown reason, calls him "Your Bloodiness" and "Mr. Baron." 
A Trap Door In The Dungeon
The entrance to Slytherin House is in the dungeon through a trap door.  The entrance is probably located there because Professor Snape teaches potions in the basement.
Quidditch Cup 1987-1993
  The Slytherin quidditch robes are green with silver trim.  The Chaser and Captain is Marcus Flint, The other Chaser Warrington, the Keeper Bletchley, the Seeker Draco Malfoy, the Beaters are Bole and Derrick.  There are no girls on the Slytherin team. 
Famous Slytherins
Thomas Riddle
He was known as Lord Voldemort, The Dark Lord, and You-Know-Who.  Voldermort was born as Thomas Malvolo Riddle in 1927 to a mother deserted by her muggle husband.  He was a talented wizard who turned to the dark side to gain power


Members of Slytherin House

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