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He guessed after Harry told him what happened with the diary. It wasn't confirmed for him until Harry managed to get the real memory from Horace Slughorn. He had a suspicion that Horace Slughorn knew much more about Voldemort than he told and that's why he convinced him to come back to Hogwarts.
What else can I help you with?
Did Albus Dumbledore see himself holding all the horcruxes in the Mirror of Erised?
No. Albus Dumbledore sees himself reunited with his family, including his imprisoned father and deceased mother and sister.
Who was Albus Dumbledore's brother?
Albus Dumbledore's brother is Aberforth Dumbledore.
When was Albus Dumbledore created?
Albus Dumbledore was created in 1997.
What killed Albus Dumbledore?
Severus Snape used a killing curse on Albus Dumbledore.
Does Albus Dumbledore smoke a pipe?
No, Albus Dumbledore doesn't smoke a pipe.
How did dumbledore destroy Lord Voldemorts ring?
Albus Dumbledore was the head of Hogwarts in the Harry Potter series. Lord Voldemort created horcruxes from different objects including a ring. Dumbledore was able to destroy Voldemorts ring by stabbing it with the sword of Gryffindor.
What is Albus Dumbledore's full name?
Aberforth Dumbledore is his full name. No middle name has ever been mentioned.
What is Albus Dumbledore's mother's middle name?
His full name is stated as Albus Percival Wulfric Brian Dumbledore.
Did Harry Potter or Albus Dumbledore destory Marvolo Gaunt's ring?
Albus Dumbledore did.
How do horcruxes link Albus Dumbledore Harry Potter and Ron Weasley?
Each of them destroys a Horcrux. (So does Hermione Granger, Vincent Crabbe, Tom Riddle and Neville Longbottom)
What are Dumbledore's middle names?
Professor Dumbledore's full name is Albus Percival Wulfric Brian Dumbledore
What song by Albus Dumbledore reached number 2?
Albus Dumbledore didn't release any songs.
