Lord Voldemort's reign of terror lasted for eleven years:
"My dear Professor, surely a sensible person like yourself can call him by his name? All this 'You-Know- Who' nonsense - for eleven years I have been trying to persuade people to call him by his proper name: Voldemort." Professor McGonagall flinched, but Dumbledore, who was unsticking two lemon drops, seemed not to notice. "It all gets so confusing if we keep saying 'You-Know-Who.' I have never seen any reason to be frightened of saying Voldemort's name.
"I know you haven 't, said Professor McGonagall, sounding half exasperated, half admiring. "But you're different. Everyone knows you're the only one You-Know-oh, all right, Voldemort, was frightened of."
Book 1 (p5)
On his demise:
Professor McGonagall's voice trembled as she went on. "That's not all. They're saying he tried to kill the Potter's son, Harry. But - he couldn't. He couldn't kill that little boy. No one knows why, or how, but they're saying that when he couldn't kill Harry Potter, Voldemort's power somehow broke - and that's why he's gone.
Dumbledore nodded glumly.
"It's - it's true?" faltered Professor McGonagall. "After all he's done... all the people he's killed... he couldn't kill a little boy? It's just astounding... of all the things to stop him... but how in the name of heaven did Harry survive?"
"We can only guess," said Dumbledore. "We may never know."
Book 1 (p6-7)
- If nobody knew/witnessed how Voldemort met his demise, why was Harry Potter given the credit for it?
- How did the news spread so fast?
- When did we find out that Voldemort's real name was Tom Riddle?