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First Wizarding War (1978–1981)As a Death Eater"The one with the power to vanquish the Dark Lord approaches… Born to those who have thrice defied him, born as the seventh month dies…."— The part of Sybill Trelawney's first prophecy that Snape overheard Snape during his time as one of Lord Voldemort's Death EatersSeverus Snape eventually joined the ranks of Lord Voldemort's Death Eaters. His actions as a Death Eater are largely unknown, though he quickly became an important Death Eater in Voldemort's inner circle. He was the spy responsible for informing Voldemort about the prophecy foretelling his downfall. In early 1980, Snape eavesdropped on an interview for Divination Professor Sybill Trelawney and Albus Dumbledore at the Hog's Head Inn. In the course of the interview, Trelawney prophesied that at the end of July, a child would be born who would cause the destruction of Lord Voldemort (which prompted Dumbledore to hire her, partly for her own safety). At that time it was not clear who was meant by the prophecy. Two children of prominent wizarding families were born that year at the end of July: Harry Potter and Neville Longbottom. Albus reported at the Wizengamot trial of Igor Karkaroff that Severus had come to him and explained that he had been the one to overhear the prophecy, and reported it to Voldemort. However, Snape did not hear the entire prophecy, as the Hog's Head's barman and Albus' brother, Aberforth, caught him eavesdropping and threw him out. As a double agentAlbus Dumbledore: "If you loved Lily Evans, if you truly loved her, then your way forward is clear. You know how and why she died. Make sure it was not in vain. Help me protect Lily's son."Severus Snape: "Very well. But never — never tell, Dumbledore! This must be between us! Swear it! I cannot bear... especially Potter's son..."— Snape promises to protect Harry after Lily's murderSnape next to Lily's HouseSeverus suffered terrible remorse when Voldemort decided that Harry Potter was the subject of the prophecy and that Lily Evans, the woman whom he always loved, was now in danger as a result of his actions. He begged Voldemort to spare her, who agreed. However, knowing that he could not leave Lily's safety in the hands of someone who could turn back at his word on a mere whim and that Lily would probably defend her child to the last breath, Snape also approached Albus Dumbledore to ask him to save Lily. He pleaded with Dumbledore to hide her, along with her husband and son if he had to. Dumbledore agreed but insisted that Severus serve him as a spy among the Death Eaters. In fact, it was Snape's request to Voldemort which allowed Lily to let herself die in order for Harry to live when Voldemort attempted to murder him, therefore ensuring that his curse backfired and Voldemort's body was destroyed in the process. Snape showing his love for Lily Evans, even after her deathDespite Dumbledore's best efforts to protect the Potters, Voldemort was tipped off by Peter Pettigrew, one of James' best friends, a spy, and he found them anyway. After Lily's death, Snape was devastated and distraught to the point of wishing himself dead, but Dumbledore urged him to ensure Harry's safety out of respect for Lily's memory; Snape initially insisted the danger had been averted with the Dark Lord gone, only for Albus to insist that he would return and everyone, particularly the boy, would be in danger when that happened. So Snape spent the rest of his life protecting her child, Harry Potter, who was often said to strongly resemble James. Distrusted for his past as a Death Eater by those on Albus Dumbledore's side, and hated by other Death Eaters for living as Dumbledore's stooge for ten years, Snape continued living on to complete Dumbledore's plan to protect Harry and defeat Voldemort.

BiographyEarly life (1960–1971)Lily Evans: "Doesn't your dad like magic?"Severus Snape: "He doesn't like anything, much."— Discussion of Snape's family and home life[src]Spinner's EndSeverus Snape was born 9 January, 1960 to Tobias Snape, an abusive Muggle, and Eileen Prince, a neglectful pure-blood witch.He began to identify with his mother's family and created a secret nickname from his mother's maiden name, calling himself the "Half-Blood Prince". His unhappy relationship with his father may have been the origin of his disdain for Muggles. It is implied that Severus was friendless and uncared for by his parents. This lack of care largely shaped Severus's bitter disposition and cruel behaviour later in his life. Severus grew up at Spinner's End, a shabby suburb of Cokeworth. This area of town was near a dirty river and full of dilapidated houses, disused factories and broken down street lamps. Through the rest of his life, Severus continued to return there when he was not at school. The young Severus is depicted as being unwashed and wearing ill-fitting clothes "that were so mismatched that it looked deliberate". As a child, Severus was neglected and his parents often fought with one another. He could not wait to leave for Hogwarts at the end of the summer. Lily Evans and her family lived in the same town, close to Spinner's End. After watching her for some time, Severus noticed her evident magical abilities and began making friendly overtures. The two bonded quickly and it appears that he was very interested in Lily right from the beginning, though she only regarded him as a good friend. During this time he also developed a contempt towards her older sister, Petunia. This was most likely because she made disparaging comments about his clothes and residence but may also be because she was a Muggle. Information from Severus's own memories of his first interactions with Lily and Petunia suggests that he was an awkward child with poor social skills. Even when it was important to him to make a good impression, he always seemed to have trouble doing so. Hogwarts years (1971–1978)James Potter: "'Gryffindor, where dwell the brave at heart!' Like my dad. Got a problem with that?"Severus Snape: "No. If you'd rather be brawny instead of brainy —"Sirius Black: "Where are you hoping to go, seeing as you're neither?"— James, Snape, and Sirius have an unpleasant first meetingSeverus attended Hogwarts School of Witchcraft and Wizardry as a student from 1971-1978 and was Sorted into Slytherin House, at that time led by Potions master Horace Slughorn. On the way to Hogwarts for his first year, Severus sat with Lily Evans on the train. While on the train they met James Potter and Sirius Black. This encounter between the three of them revolved around a disagreement regarding what Hogwarts house was the best. This hostile first encounter would set the tone for the antagonism between the three of them for the rest of his life. Sorted into Slytherin House upon their arrival at the school, classmates would later state that Severus excelled in the Dark Arts from an early age. At the age of eleven, he knew more curses and hexes than most of the seventh year students, according to Sirius Black. He was credited with creating a good number of popular spells like Levicorpus, Liberacorpus, Muffliato, and curses like Langlock, the Toenail Growth Hex, and his signature curse, Sectumsempra. He reportedly was friends with a gang of Slytherins who later became Death Eaters, including Avery, Mulciber, Bellatrix Black, Rodolphus Lestrange, Evan Rosier and Wilkes. Severus also had contact with Lucius Malfoy, who was a prefect during his first year and greeted him kindly when he was Sorted into the Slytherin House. Most likely the two had good rapport at Hogwarts (which could also be a reason why Narcissa Malfoy trusted Severus to take care of Draco Malfoy and why he seemed to favour Draco during his later teaching years even when Draco refused it in the task to kill Dumbledore). Remus Lupin and Peter Pettigrew were also classmates of Severus. Around the same time, he also got acquainted with another notorious troublemaker; a Fifth year student by the name of Patricia Rakepick who not only was in the same house as his new school rivals, but also actively sought to mentor her younger schoolmates in the art of mischief-making without getting caught: While popular with many of their peers for her, she was, on the other hand, strongly disliked by most of the teachers for her excessive rebellious streak, frequent rule-breaking and the bad influence she was on her younger housemates. No less discontent with her behaviour than their professors were, Severus's mistrust in Rakepick ran deeper still; she was an avid advocate for the existence of the fabled Cursed Vaults of Hogwarts. While her claims were dismissed by the faculty of the day, young Snape, however, was not so certain; seeing her as uncommonly ambitious for a Gryffindor and, he recognised, far from stupid, he eventually came to question her motives and her intentions for the vaults, eventually coming to regard her as a danger to the school and all who resided at the castle. James and his group of friends were constantly at war with Severus throughout their school years. Severus's memories, recorded in the Pensieve, suggest that he was an introverted and studious individual, whereas James was arrogant, popular and athletic. Immediately upon meeting him, James disliked Severus for expressing a desire to be in Slytherin. James's big crush on Lily, and Severus's close friendship and unrequited love for her also heightened the tension between the two. Snape being bullied by the MaraudersOne recorded memory in the Pensieve bore witness to James bullying him, turning him upside-down to reveal his underwear in front of many students, including Lily. This action was proved to be very offensive and it increased the hatred between the two adolescents. In this accident, Lily came to Severus's defence, but this only made things worse: in a subsequent lashing out at James in an attempt to recover his lost dignity, Severus inadvertently called Lily a Mudblood. Lily refused to forgive him for it, even after his repeated apologies. This would forever be Severus's worst memory. Severus noticed that Remus kept disappearing during the full moon and once followed him past the Whomping Willow (after being tipped off on how to do so by Sirius Black) to confirm his suspicions. This act could have cost Severus his life, as had it not been for James going after him to stop him when he learned of Sirius' 'prank', he might have found himself all on his own and caught off guard by a fully-fledged werewolf. As it was, however, James did reach Severus in time and managed to save him just before he got to the Shrieking Shack while Remus was in his wolf-form. Albus Dumbledore swore Severus to secrecy, but the true nature of Remus was clear to Severus. By their seventh year, James had grown out of his immaturity and arrogance to the point that Lily agreed to start dating him, even though he never grew out of his hatred for Severus — according to Sirius, Severus had always been a "special case" with James. Lily ended up marrying James, which only strengthened Severus's bitterness towards him.[29] There was also some overlap between his school career and that of a younger student by the name of Jacob, yet another rule-breaker Snape came to severely dislike. During the later part of his magical education, the school was plagued by several dangerous curses unleashed upon the school by Jacob after he tampered with the fabled Cursed Vaults, which resulted in the death and injury of several of his peers, although he suffered no permanent injury himself. Half-Blood Prince"This book is the property of the Half Blood Prince."— The inside cover of the textbook[src] Severus was a talented wizard even in his childhood. It was apparent through the notes and scribbles in his potions textbook that he made time during classes to invent curses, charms, and clever potion innovations, while simultaneously learning the required textbook lessons.[30][26] The Half-Blood Prince's many annotations and correctionsSeverus's potions textbook contained a few spells and curses which he was credited with inventing: Levicorpus, which grabbed the victim by the ankle and dangled him/her upside-down,[31] and Sectumsempra, which caused slashing bloody cuts (guided by the wand gestures of the caster, like a blade/sword) which bled extensively.[32] Levicorpus somehow escaped from Severus's secrecy, and became very popular around Hogwarts towards the end of his fifth year at school. Some other spells included Muffliato, which filled the ears of anyone nearby with an unidentifiable buzzing sound and another hex that caused toenails to grow at an unnaturally fast rate.[31] Severus's book later fell into the hands of Harry Potter in September 1996. Harry used the Half-Blood Prince's tips and earned praise with that year's Potions master, Professor Slughorn. Harry considered the Half-Blood Prince to be a better teacher than Severus, unaware at that point that Severus was the Prince, much to Harry's later displeasure.[26] The potions textbook has an inscription indicating it is Property of the Half-Blood Prince. Hermione Granger's research revealed that Prince was the maiden name of Severus's mother and so the nickname was revealed to be a combination of his mother's maiden name and his blood status. Harry Potter also pointed out the similarities between Snape's nickname and the name Voldemort gave himself. This nickname was apparently a secret, as Remus did not remember it ever being used publicly by Severus.