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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.