Про Салазара Слизерина
Выдержка из "Истории Хогвартс":
Salazar Slytherin believed that only pure-blood witches and wizards should be allowed to attend Hogwarts. He got into an argument with Godric Gryffindor about this and eventually left the school. There was a legend that Slytherin built a secret chamber somewhere in Hogwarts that only his true heir would be able to open. This chamber, called the Chamber of Secrets, contained a monster that would finish his "noble purpose" of killing all the Muggle-born students at Hogwarts.Slytherin was a Parselmouth.
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