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What iron-clad reason did Dumbledore have for believing Snape was on his side? Maybe he was a good actor and a double agent. Was it just that he loved (or pretended to) Lily or he used legilimency?

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In Deathly Hallows, Dumbledore witnesses Snape’s doe Patronus; evocative of Lily. I don’t have the quote in front of me, but I think it’s implied that it’s not the first time Dumbledore has seen it. Might that count? – alexwlchan May 6 '14 at 17:08
I came here for a Huey Lewis and the News reference. – Dacio May 6 '14 at 18:36
I rarely -1. But my reason here is that you have assumptions in your question without evidence. – Mooz May 7 '14 at 1:51
@Dacio See this comment! – kitcar2000 May 7 '14 at 16:13
up vote 22 down vote accepted

Dumbledore didn't have "iron clad" reason. But he believed in the deep power of the ancient magic of love (with good reason - witness Harry being the ONLY ever survivor of Avada). And he knew the depth of Snape's feelings (after all, Snape came to him on his own to ask to protect Lily)

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Harry was the only ever survivor of Avada -- twice! (And yes the second time was partially because of love... I think.) – trysis May 6 '14 at 18:55
@trysis - while true, the second time was probably irrelevant to the question since at the time BOTH Snape and Dumbledore were dead. – DVK-in-exile May 6 '14 at 20:56
sorry, I thought you meant the power of love in general not how/when Dumbledore would have seen it. – trysis May 6 '14 at 21:27
that's the power of love – hayd May 7 '14 at 11:35

Dumbledore believed Snape because he saw how devastated he was after having betrayed Lily. At that moment, Snape swears to do anything and everything to get revenge at Voldemort, to defy him.

Maybe Dumbledore additionally used legilimency and saw Snapes true emotions. But there is no canon evidence for that.

Additionally, every time someone noticed someting suspicious about Snape and told Dumbledore, he already knew it because Snape told him himself or he had told Snape to do so (stopping Quirrel, the Unbreakable Vow, pretending to help Malfoy).

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Legilimency seems unlikely - I thought Snape was a master of Occlumency. – Donald.McLean May 6 '14 at 15:59
@Donald.McLean I don't know for certain, but the Elder Wand may be of some use against the most gifted Occlumency master. – David Wilkins May 6 '14 at 18:32
And probably Snape did not use Occlumency with Dumbledore. – Lars Ebert May 6 '14 at 18:35
Yes but Dumbledore is an "accomplished" (or was it "proficient"?) practitioner of Legilimency but I think he was being modest. Also as @DavidWilkins said Dumbledore had the Elder Wand. – trysis May 6 '14 at 18:54

Adding something more to the answers.

The important thing to remember here is that everyone, including Snape, believed Voldy was dead.

The following excerpt from HP & the Deathly Hallows - chapter Prince's Tale. Conversation between Dumbledore & Snape in Snape's memories

"You know how and why she died. Make sure, it was not in vain. Help me protect Lily's son"
"He does not need protection. The Dark Lord has gone - "
" - The Dark Lord will return, and Harry Potter will be in terrible danger when he does"

Snape loved Lily. That is the Iron Clad truth. IIRC, Snape, after having mentioned the Prophecy to Voldy, pleaded him to let Lily live & only kill Harry & his father.

Snape was not the kind of person to follow Voldy out of fear. Snape was ambitious & looked up to Voldy. Voldy could have yanked Lily away & killed Harry & let her live. But he didnt care. Snape was obviously devastated. And Voldy was gone, so no double agent opportunities were yet presented to him.

When Dumbledore tells him that Voldy will return & the boy, who has Lily's eyes, would be in great danger, Snape has an opportunity to redeem himself, avenge his love & prove his love for Lily more to himself than anyone else

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Do you have canon proof that Snape believed that Voldemort was dead? Hagrid didn't (neither did Dumbledore) – DVK-in-exile May 7 '14 at 10:57
@DVK Dumbledore is not included in the everybody bracket as mentioned in the last para of answer. As for others, let me check with the books for specific quotes – KharoBangdo May 7 '14 at 11:00
@DVK found the quote in HP7 Prince's tale. Apparently ambiguous gone but since it is preceded by "Help me protect Lily's Son" followed by "He does not need protection" seems to suggest Snape believed Voldemort was dead & not returning. Proof is contextual. Hagrid had a long monologue in which it is contextually clear that he believed Voldy was alive. – KharoBangdo May 7 '14 at 13:45
Who's Voldy? ;) – ypercubeᵀᴹ Feb 29 at 21:39

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