jan 1, 1967 - Voldemort hides the Diadem Horcrux in the Room of Requirement

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Ten years after the death of Hepzibah Smith, Voldemort returns to Hogwarts, ostensibly to ask Dumbledore for a teaching job. Dumbledore refuses. Voldemort then curses the Defence Against the Dark Arts position, and since that day, no professor has stayed for more than one year in that post. Voldemort’s true purpose for the visit was to hide one of his Horcruxes — the Diadem of Ravenclaw — inside the Room of Requirement.

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