How did Dumbledore not know Quirrell was Voldemort?

How did Dumbledore not know Quirrell was Voldemort?

TL; DR - Dumbledore knew by Quirrell's behavior that he was possessed by Voldemort. He moves Quirrell to Defense Against the Dark Arts to remove him (and Voldemort) from the school by the end of the year.

Why didn't Professor Quirrell and Voldemort find the Philosopher's Stone?

Quirrell, on the other hand, was not able to get the Stone, because what he wanted most was to give it to Voldemort. So when he looked in the Mirror, all he saw was himself giving it to Voldemort. He didn't see himself getting it first.

Why did Quirrell turn to ash?

Because the blood wards left upon him by Lily Potter made it so that anyone who tried to kill him would be killed. Quirrell had intentions to kill Harry, so the blood wards on Harry burned him. Short answer is Quirrell was a HORCRUX, therefore there were two souls in one body.

Why did Snape say he did not know Quirrell was possessed?

• Just because Snape claims not to have known Voldemort was possessing Quirrell doesn't mean that he didn't actually know at the time. We know that he pulls the wool over the eyes of other Death Eaters all the time. This could be one such occasion. Claiming that he didn't know Voldemort was involved could just be part of his cover act.

Why did Dumbledore use Snape as an agent?

• Dumbledore certainly suspected Quirrell of something, and used Snape as an agent for keeping an eye on him. Snape was pretty smart, so he might have suspected. Dumbledore turned a page, and said, without looking up, “Keep an eye on Quirrell, won’t you?”

Why did Snape save Harry at the Quidditch pitch?

• In muttering his countercurse at the Quidditch pitch and saving Harry, Snape shows that either he already suspected and was under orders to stop Quirrell OR he was simply doing it because of his obligation to protect Harry from his promises to Dumbledore and because James saved him once, or for Lily's memory.

Where did Quirinus Quirrell first meet Lord Voldemort?

• Quirinus Quirrell first met Lord Voldemort in 1991, in the forests of Albania, where Voldemort subjugated Quirrell into servitude. Quirrell brought him back to Britain, and eventually to Hogwarts.