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In the Harry Potter universe, Severus Snape is a teacher of Potions and head of Slytherin House at Hogwarts School of Witchcraft and Wizardry. Use for questions about the character. Use with the [harry-potter] tag

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Has Rowling ever expressed her opinion on whether Snape is a good teacher or not?

I realise it can be quite a speculative subject, but I believe JKR herself must have had some distinct image of Snape's teaching role in Hogwarts. Evidences seem to be contradictive though. We know ...
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Harry Potter fanfic, with Snape and a Muggle who becomes pregnant

I'm looking for a Harry Potter fanfic in which Severus Snape is out and about in the Muggle world and meets a Muggle woman. After a one-night-stand or more times together, she gets pregnant. When she ...
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Why didn't Snape work out Voldemort had Horcruxes?

Snape is repeatedly referred to as a highly intelligent wizard, most skilled in the Dark Arts. We don't know for sure, but it seems probable he would know about Horcruxes, at least in theory. He ...
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When/why did Voldemort reconsider letting Snape know about the Elder Wand?

When Voldemort is about to break into Dumbledore's tomb to take the Elder Wand, the following happens: "I shall join you in the castle shortly," he said in his high, cold voice. "Leave me now." ...
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Snape's curious reaction in The Goblet of Fire

Every time I reread The Goblet Of Fire I stumble on one sentence: "I saw Voldemort come back!" Harry shouted. He tried to get out of bed again, but Mrs. Weasley forced him back. "I saw the Death ...
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Why did Voldemort trust Snape after his betrayal which cost Voldemort his body?

When Voldemort planned to kill baby Harry, Snape leaked this to Dumbledore, who in turn alerted the Potters, which finally cost Voldemort his body. If the Potters didn't know beforehand, he would have ...
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Why did Dumbledore let Snape tell what he heard to Voldemort?

Snape was caught eavesdropping on Trelawney's prophecy by Aberforth and Albus Dumbledore (How did Trelawney know Snape interrupted her interview with Dumbledore (and her prophecy)?). Based on Lily's ...
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When did Snape learn Sirius was an animagus?

In Harry Potter and the Prisoner of Azkaban when they are learning the truth about Sirius, they all hear a creak behind Lupin and the door opens by itself. We go on to learn that the Marauders are ...
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Were Snape's memories complete?

Were the memories that Severus Snape gave Harry complete? There are a few cases where they seem to be missing critical information, but it's unclear to me if that's because Snape didn't know it, that ...
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Why did Snape become a teacher?

Why did Snape become a teacher when he hates children so much? Why didn't he, for instance, set up a potions emporium on Diagon Alley?
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How did Snape come to know so much Dark Magic before Hogwarts?

According to Sirius, Snape was a real expert in the Dark Arts before he came to Hogwarts. "Snape's always been fascinated by the Dark Arts, he was famous for it at school. Slimy, oily, greasy-...
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What curses leave marks or scars? [closed]

We all know Harry got his lightning-shaped scar from the Killing Curse. However he was the first one to survive, thus the first one to obtain a scar from it. But Hagrid tells Harry that being touched ...
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Why could Snape be heard in Grimmauld Place?

In the early part of Order of the Phoenix the Order is having a meeting, talking about Harry. We can hear Snape but when everyone else comes down to eat Snape is the only one who isn't there. So why ...
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When did Snape join the Hogwarts staff?

I was reading the answer here Snape dressing up as Darth Vader fanfic It mentions a fan-fiction which states Snape joined the Hogwarts staff when he was 20, possibly making him the youngest ...
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Why did Severus Snape think he could make Voldemort promise anything?

A young Severus Snape asked Voldemort not to kill Lily Potter. He knew Voldemort wanted to kill Lily's baby son, but asked that Lily be spared because Snape was in love with her. “What request ...
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Why does Snape read an article about Harry from Witch Weekly?

What is Snape’s motivation in the scene in the Potions lesson, during which Snape reads to the class an article about Harry from Witch Weekly?
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Was Lily the sole reason for Snape being cold hearted and callous in general?

It's well known even in the first book that Snape is a cold hearted person who has very little sympathy for anyone, even his fellow Slytherins. We find out in the last book that he is still in love ...
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Why did Snape claim that Tonks's Patronus looked weak?

Why did Snape claim that Tonks's Patronus looked weak in the 6th book? Did he know how she felt about Lupin? If so, how? Did he read her mind? And why did he say that given what his Patronus was?
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What makes the Whomping Willow so valuable to Snape?

At the start of Harry's second year, Harry and Ron arrived at Hogwarts in a flying Ford Anglia which crashed into the Whomping Willow. Snape had several objections to this theatric arrival, his main ...
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In Book 6, why were Dumbledore's and Snape's combined efforts in making Malfoy reveal his murder plans so feeble?

My previous question is regarding why Dumbledore refused to react after learning about Malfoy's celebratory whooping. This question is about why he and Snape together failed to make Malfoy confess his ...
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Why did Hagrid say that Snape was one of the protectors of the Philosopher's Stone?

When Hermione, Ron and Harry tell Hagrid that Severus Snape is trying to steal the Stone, Hagrid replies that he is one of the teachers protecting the Stone. HARRY:...
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If Snape is a Slytherin, how come he was able to touch the Sword of Gryffindor?

"Only a true Gryffindor could have pulled that out of the hat." Dumbledore, in Chamber of Secrets Snape carried the sword of Gryffindor to the Forest of Dean, and placed it in the frozen ...
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Why did Snape want to teach Defence Against the Dark Arts even after knowing it was cursed?

I know of this question Why did Snape want the Dark Arts job? But my question is a bit different. I want to know even when Snape knew that the dark arts job was jinxed by Voldemort himself and ...
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Did the Order of the Phoenix know that Snape was a double-agent?

Simple question: discounting Dumbledore (who knew Snape's loyalty was with him) and, eventually, Harry, did the other members of the Order of the Phoenix like Sirius, Remus, Hagrid and others know ...
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What is the relationship between Snape's Patronus and Lily? [duplicate]

When I read the Harry Potter series I found this part confusing! Is there a relationship between Lily Evans's and Snape's patronus?!
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When did Voldemort decide to recruit Severus Snape?

Clearly, Tom Riddle was already assembling his future-DEs clique back in Hogwarts (as we saw in Slughorn's pensieve memory). However, Severus Snape wasn't in it yet (probably age difference?). Do we ...
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How did Snape actually help Dumbledore? [duplicate]

Just finished the final book last night. I understand that (spoilers)
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Why didn't Snape suspect that Moody was an impostor? [closed]

In Philosopher's Stone, Dumbledore suspected that Quirrell is up to something, and ordered Snape to keep an eye on Quirrell. In Goblet of Fire, Moody is the Defense Against the Dark Arts teacher, but ...
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Did Dumbledore know that Snape was bullying Harry and Neville? [duplicate]

Snape is a triple agent. He sided with Dumbledore because Voldemort killed Lily, the only person who Snape loved and cared. Snape was a spy among the Death Eaters and was giving information to ...
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How can Voldemort trust Snape after the events of the first book? [duplicate]

In the Sorcerer's Stone, Snape was playing with the Quirrell the double agent job. He was persuading him to find out how to get the stone. "Have you found out how to get past that beast of Hagrid's ...
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How much did McGonagall know about Snape? [duplicate]

A follow-up question of What did Professor McGonagall know about the Order of the Phoenix? It seems that before the Battle of Hogwarts, McGonagall faced Snape in a brief battle. Snape escapes as a ...
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Why did Snape give his loyalty to Dumbledore after Dumbledore failed to carry out his part of the deal?

When Snape learned that Lily Potter was in danger, he approached his enemy Dumbledore (remember, Snape was a Death Eater back then). In exchange for protecting Lily, Dumbledore asked for the loyalty ...
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How come Snape and Lily have the same patronus?

Why is Severus Snape's patronus the same as Lily Potter's? Are Snape and Lily related somehow? Are Snape and Harry related?
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Did Snape really love Lily, or was it just an obsession? [closed]

Did Snape really love Lily, or was it just an obsession? Did Lily love him as more than just a friend when they grew up to be adults, or was it just Snape? An intelligent man once said that love is ...
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Doesn't Snape see Peter Pettigrew on the map in Prisoner of Azkaban?

So, I see lots of posts on why Fred and George didn't notice Peter Pettigrew on the Marauder's Map, but why does Snape not see Peter Pettigrew on the left of the map when seeing where Lupin went, ...
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Why did Harry not question finding out Snape was a Death Eater?

In Harry Potter and the Goblet of Fire, Harry falls into the Pensieve in Dumbledore's office and experiences Dumbledore's memory of Karkaroff's confessions. During this memory, Karkaroff mentions ...
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How could potions be correctly made following the standard instructions? [duplicate]

In Harry Potter and the Half Blood Prince, Horace Slughorn, the former potions master, returns to teach at Hogwarts. In his class, unlike that of Snape's, students follow the standard potions book, ...
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Why was the plan for how to move Harry leaked to Voldemort? [duplicate]

The plan for moving Harry before he turned 17 seemed highly risky at best given the fact that its details were leaked to Voldemort. Why did Snape plant this idea on Mundungus, just to deliberately ...
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Did Harry Potter ever start looking up to his father again?

It is known that after experiencing Snape's memories of being bullied by James Potter, Harry felt "miserable and cold" when thinking of his father. Did that ever change back to normal, or did Harry ...
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Why didn't Snape go looking for Voldemort in order to draw him out and prevent his return?

When Voldemort's fragile soul fled to Albania, either pre- or post his adventures on Quirrel's head, why didn't Snape travel there and seek to draw him out of his hiding? This, to me, seems to be ...
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Why did Snape become a Death Eater to begin with?

Snape was in love with a half-blood. So why in the world would he become a death eater, and join a cult which desired to rule over, and indeed often kill, half-bloods and muggles? Was this ever ...
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What concrete aid did Severus Snape provide the Order while he was under cover?

What concrete aid did Severus Snape offer the Order during his second "tenure" being undercover with the Death Eaters? A few things he did do that I can think of offhand: Probably the biggest and ...
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Did Lily ever find out that Snape had changed sides?

The decision to hide the Potters was done partly on the basis of the information that Snape passed to Dumbledore after he'd overheard Sybill Trelawney's prophecy. "Hide them all, then," he croaked. ...
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Would Snape have switched sides if Voldemort never attacked Harry and the Potters and instead attacked Neville and the Longbottoms? [duplicate]

In Deathly Hallows, we learn that Snape switched sides and obeyed Dumbledore once Voldemort started hunting down Harry's mother, Lily Potter. Evidence is below, from the Deathly Hallows: “Severus ...
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Why didn't Snape see Dumbledore's Army in Occlumency lessons with Harry?

In Harry Potter and the Order of the Phoenix, why didn't Snape see Dumbledore's Army in Harry's mind during Occlumency lessons?
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Why didn't Snape just kill Voldemort to buy more time while the latter was recuperating as a Horcrux?

When Snape was in the company of Voldemort, why did he not just use Avada Kedavra on him? Voldemort's body would again be destroyed, and he'd become a soul again, and we know that in this form, ...
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Wasn't it actually Snape disguised as Lupin who met Harry, Hermione, and Ron in 12 Grimmauld Place?

I have the feeling that it was Snape, disguised as Lupin, who showed up in 12 Grimmauld Place in the chapter The Bribe in the last Harry Potter book. Supporting evidence for the claim: Snape already ...
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Why would Dumbledore say “After all this time?” to Snape?

When Snape's changed his allegiance from Voldemort to Dumbledore he did so expressly because he wanted to honour Lily's memory by protecting Harry. It was Dumbledore himself who persuaded him to take ...
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What form would a boggart take for Snape?

Is there any canonical mention of the form taken by a boggart in Snape’s presence? One would assume that Lily’s dead body would be the most likely answer, but I’m just curious if JKR has ever ...