Severus Snape 9 January, 1960 – 2 May, 1998 The Bravest Man I Ever Knew!
"– Severus Snape wasn't yours, – said Harry, – Snape was Dumbledore's. Dumbledore's from the moment you starting hunting down my mother. And you never realized it, because of the thing you can't understand."
"Harry Potter and the Deathly Hallows" Chapter 36: The Flaw in the Plan