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Tom Riddle made his first Horcrux, the diary, on or very shortly after June 13, 1943, during his fifth year at Hogwarts. On that date, Riddle released the basilisk from the Chamber of Secrets, ordered it to kill fellow student Myrtle (who returned as the ghost Moaning Myrtle), and used that murder to split off a piece of his soul, making the diary into a Horcrux.

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