Harry Potter and the Deathly Hallows
by J.K. Rowling
Gregorovitch is a famous European wandmaker – he seems to be the equivalent of Mr. Ollivander, and even made Viktor Krum's wand. He's rumored to have been a possessor of the Elder Wand (a rumor that he started, mind you), but he actually only had it for a short while, until the young Grindelwald stole it. He's tortured and killed by Voldemort.