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Tom Riddle's diary was the first horcrux he ever created. He created it during his fifth year at Hogwarts. This means that the horcrux was created before the events of the first book, and before Harry was even born.

In Chamber of Secrets, Tom Riddle's projection (Voldemort's horcrux) knows who Harry is and how he defeated him when he was a baby.

How did the horcrux know all this? Are the horcruxes or these pieces of soul somehow connected to each other, so they are aware of what's happening to each one of them?

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Ginny told Riddle about Harry’s history.

When Harry is talking to Riddle’s in the Chamber, he explains:

“And why did you want to meet me?” said Harry. Anger was coursing through him, and it was an effort to keep his voice steady.

“Well, you see, Ginny told me all about you, Harry,” said Riddle. “Your whole fascinating history.” His eyes roved over the lightning scar on Harry’s forehead, and their expression grew hungrier. “I knew I must find out more about you, talk to you, meet you if I could. So I decided to show you my famous capture of that great oaf, Hagrid, to gain your trust.”

Chamber of Secrets, chapter 17 (The Heir of Slytherin)

It’s unlikely the horcruxes and/or soul fragments were at all aware of each other, let alone able to share memories – if they were, Voldemort would surely have been aware that they were being destroyed long before he actually did.


It’s also worth noting that Riddle’s knowledge of past events is incomplete. He’s clearly received a second-hand record of events; this isn’t the description of somebody who was there:

“No one knows why you lost your powers when you attacked me,” said Harry abruptly. “I don’t know myself. But I know why you couldn’t kill me. Because my mother died to save me. My common Muggle-born mother,” he added, shaking with suppressed rage. […]

Riddle’s face contorted. Then he forced it into an awful smile.

“So. Your mother died to save you. Yes, that’s a powerful counter-charm. I can see now – there is nothing special about you, after all. I wondered, you see. […]”

Chamber of Secrets, chapter 17 (The Heir of Slytherin)

When Harry meets Voldemort in Goblet of Fire, he’s worked out that it was Lily’s sacrifice which saved him. I think it’s very likely he’d worked this out before Chamber of Secrets – he had years to think about it – but the diary!Riddle knows nothing about it.

  • I agree with your conclusion but I have a couple thoughts: (1) I believe (but I could very well be wrong) that only the diary Horcrux had memories as such; that doesn't mean there wasn't something more to them: obviously there were the protective enchantments, curses etc. and the locket did seriously manipulate the trio (much like the diary manipulated Ginny) - and try to prevent its imminent ruin - but does that count as having memories as such? I always was under the impression the memories were preserved in it. (2) If the Horcrux was destroyed how could it tell others Horcruxes? :) – Pryftan May 12 '18 at 17:37
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Riddle tells us that Ginny told him the general consensus on what happened that night, about everything that she knows happened during Harry's first year from what her brothers told her, but she doesn't know what happened on that night, and so Riddle is actually relying on a second hand account of those events. We know Ginny told him, because the book tells us she did,

"Well, you see Ginny told me all about you, Harry." Chapter 17, The Heir of Slytherin.

From this we can gather that he doesn't know anything about what has happened since he was 16.

  • 2
    This doesn't seem to add anything to the accepted answer, you're just reiterating the same quote. – TheLethalCarrot Jun 25 '18 at 8:56

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