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The Half-Blood Prince is the nickname of Severus Snape while at school.

Introduction[]

The self-titled Half-Blood Prince is an ex-student at Hogwarts with a proficiency in Potions.

From the Story[]

Harry Potter and the Half-Blood Prince[]

Discovered in chapter 9, The Half-Blood Prince[]

An old copy of Advanced Potion Making contains annotations and helpful notes in the margins from the Half-Blood Prince, which help Harry during his N.E.W.T. level Potions lessons. These include changes to the methods of preparing the potions, and even the ingredients.

Discovered in chapter 24, Sectumsempra[]

The curse Sectumsempra was invented by the Half-Blood Prince, who wrote the incantation in their copy of Advanced Potion Making.