Severus Snape was born on January 9, 1960 in the industrial town of Spinner’s End outside of Manchester. Whether or not his parents ever truly wanted a child is not something he ever considered, but his mother was harangued and his father an abusive Muggle with no love for anything – especially magic, which he felt to be untrustworthy at best and dangerous at worst. It was no surprise that Severus Snape escaped into his own, private little world from an early age – discovering magic and counting the seconds until he would board the Hogwarts Express and be free of it all.
Despite being a witch from a respected Pureblood family, Eileen Prince married a Muggle against the wishes of her parents and was, as such, forbidden her rightful portion of the family’s already-diminishing wealth. Why she married such a miserable and bullying man as Tobias Snape in the first place, Severus never knew but it was quite clear why she stayed with him – she was scared.
Tobias Snape was a formidable and cruel man and despite his lack of magical ability, he made up for it in browbeating and physical threats. Although Eileen could have cast any number of spells to bring the man to heel, she never did – and Severus could never understand why. Perhaps she was afraid to be left alone in the world if her attempts backfired? Or maybe she simply was not the witch that she had once been.
Early on, Severus discovered his own magical ability and unlike many youths he made efforts to control it. While he lacked in practical ability at first, he secured a great deal of theory from his mother’s disused books at their home. Often, when his parents would fight and generally forget he was there, he would open advanced magical texts and dream of the times to come when he could use them. The times when he would never need to be scared or bullied or ineffective again.
As a boy, Snape would often prowl the streets around Spinner’s End – often watching the Muggle children play from his hidden vantage points. He would never talk to them, of course. Lonely though he was, he never felt that Muggles were worthy of his time. After all, the only Muggle that he knew was his father and he was a hateful, miserable man who only wanted those around him to suffer as much as he did.
His isolation changed quite suddenly when he saw a girl who, like him, could do magic. A Muggleborn, Lily Evans was unaware of her true nature until Severus chose to reveal it to her – making his first of precious few friends. Together they anticipated the invitation to Hogwarts that would surely come soon – Severus even going so far as to nurse an unrequited love for her. It was Snape who helped her move beyond hapless magical experimentation, the pair of them learning to do some limited but purposeful magic before they finally went away to school.
Despite his excitement and his newfound friend, Severus was still highly introverted and disinterested in socializing beyond Lily. His desire to be sorted into Slytherin put him at odds with two boisterous and mischievous students – James Potter and Sirius Black. Even before they arrived at Hogwarts they had decided they firmly disliked Severus, calling him Snivellus – and Severus himself hated them a great deal himself.

In his First Year, Snape discovered just how much he enjoyed the power and mystery of the Dark Arts. Although he had read and knew more about them than other students, it was only when he learned just how forbidden they were that he sought to seek out instruction in them. After being sorted into Slytherin like he wanted, Snape became friends with a number of people who shared his interests – including Evan Rosier and Lucius Malfoy. Despite his love for the Dark Arts and his unwholesome friends, he managed to maintain his friendship with Lily until a regrettable instance in his Fifth Year. After being teased mercilessly by James and Sirius, using spells which he himself had created against him; Snape’s pride was severely wounded. When Lily came to his aid, he lashed out in his anger and called her a mudblood. She never forgave him and some years after began dating James Potter, driving Snape further into the company of the men who would become Death Eaters. Potter may have saved him from a nasty fate at the hands of Remus Lupin in werewolf form, but Snape still blamed him for bringing about the events that would forever sever him from Lily.
In his final, lonely years at school Snape retreated into himself and began developing new spells and innovative methods for Potions-making. But his love for Lily was still strong within him and even though she never deigned to say a word to him, he passed all his new creations and methods along to her as he tried to win back her friendship. She could never forgive him for what he had said, but Snape always felt that she had appreciated his efforts and used them to better her marks.
After his graduation, Snape fell in with Voldemort’s Death Eaters along with many of his Slytherin classmates and friends. At first he felt it to be the ideal place that he had always wanted to be – somewhere he belonged and where Muggles would be subjugated for their ignorance and their brutality and their fear. Becoming one of Voldemort’s most prized and faithful agents, Snape was sent away to Hogwarts to apply for the Defence Against the Dark Arts teaching position. It was there that he learned of the prophecy about a child who bring about the Dark Lord’s downfall and would be born at the end of July. He was stricken with guilt when he discovered that the Dark Lord had decided to focus his attention upon Lily’s son – Harry Potter.
Remaining a double agent in the Death Eaters’ ranks, Snape applied for the Defence Against the Dark Arts position on Voldemort’s orders but was instead made Hogwarts’ Potions Master. It was here that Snape remained after Voldemort was finally defeated as it had been prophesized, although at the cost of his love and quite possibly his only true friend. Lily had been killed, sacrificing herself for the Boy Who Lived.
Snape stayed at the school to teach, Dumbledore vouching for him as a double agent when the Ministry sought to incarcerate former Death Eaters. Under Dumbledore’s trust and protection, he was still teaching at Hogwarts when – some years later – Harry Potter arrived to begin his schooling there. Snape saw in the boy Lily’s preference for another man and the knowledge that she had died so that he could live. While he had vowed to keep the boy safe out of his own duty to Lily, he could not bring himself to like him – he reminded him too much of painful memories best kept in the past.