Around circa 995, the school is founded by four witches and wizards:  Godric Gryffindor, Helga Hufflepuff, Rowena Ravenclaw, and Salazar Slytherin. While Gryffindor, Hufflepuff, and Ravenclaw wanted to teach all wizardkind, Slytherin wished to teach only Pure Bloods. However, the other founders did not agree.  Infuriated, Slytherin left the school but not before planting a Basilisk egg and built the Chamber of Secrets. 

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