Severus Snape is a British wizard. He is a Death Eater during the Wizarding War before switching sides and becoming a double agent for Albus Dumbledore. He becomes Hogwarts' potions master and head of house Slytherin from the end of the War until 1992. A large part of his life is defined by his secret love for Lily Evans, Harry Potter's mother.

In 1992, Snape can be considered the third most powerful wizard in Hogwarts after Albus Dumbledore and Professor Quirrell.[1] He is also quite smart and helps Dumbledore reason about Riddle's plotting and complex time-travel scenarios.


During the war, Snape is a Death Eater before switching sides because of his secret love for Lily Evans who is killed by Voldemort.

1991-1992 school year

At the beginning of the school year, Snape provokes Harry because he resents him for being the son of James. However, Harry denounces his behavior and threatens Dumbledore to leave Hogwarts so Snape is forced to promise to stop being abusive towards "students in their fourth year and younger".

Snape also acts against bullying though not openly. In October, he suggests to Harry that he helps Lesath Lestrange who is being bullied by Gryffindors. In the winter, he helps the S.P.H.E.W. by having Rianne Felthorne leave them notes (signed "S.") telling them where to find bullies to fight.

Over the school year, through discussions with Harry and with Rianne Felthorne, Snape realises that his enduring, unreciprocated love for Lily is unhealthy. He also realises that neither Voldemort nor Dumbledore helped him understand this because it allowed them to use him. In April, Harry and Minerva McGonagall will agree that Snape doesn't seem to be in love with Lily anymore.

On June 13th, when Riddle goes to steal the Philosopher's Stone, Snape is charged with guarding the third-floor corridor where it is kept. Riddle easily defeats him and casts the hyakuju montauk torture spell on him as revenge for his betrayal.

The next day, Snape resigns from his position and leaves Hogwarts. Harry tells him his wrongdoings have been repaid and encourages him to start over without guilt.


  1. Ch. 74, Ch. 101