Tom Marvolo Riddle creates his first Horcrux: the diary

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He uses the recent murders and the knowledge he gained from Slughorn to work the Dark Magic required to turn the diary into a Horcrux (HBP23).

Timeline Notes

Tom says that he placed his "sixteen-year-old self" into the diary (CS17), so he must have done it in the fall after the summer when he killed the Riddles and before he turned 17 at the end of December. His conversation with Slughorn where he learned about Horcruxes must have taken place after school started that September, so the timeframe for the creation of the diary Horcrux is between September and December, 1943 [Y-37]. All along, Tom realized that Dumbledore was watching him closely (HBP23).

Tom Marvolo Riddle creates his first Horcrux: the diary
Date circa September, 1943
Type of Event Wizarding world

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Tags: diary

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