Muggles' Guide to Harry Potter/Characters/Gregorovitch

Overview
Gregorovitch is a wand-maker, possibly equal in ability to Mr. Ollivander, who apparently set up shop in the northern part of Eastern Europe.

Goblet of Fire
At the Weighing of the Wands ceremony, prior to the First Task of the Triwizard Tournament, Mr. Ollivander is called in to check that the Champions' wands are functioning correctly and up to full power. He recognizes Viktor Krum's wand instantly as a "Gregorovitch creation".

Deathly Hallows
After his escape from Privet Drive, Harry Potter has "dreams" in which he shares some of Lord Voldemort's thoughts. Voldemort is looking for one Gregorovitch. Harry does not immediately remember this name, though it rings faint bells. It is at the wedding of Bill and Fleur, when a disguised Harry is talking to Viktor Krum, that he remembers that Krum's wand was made by Gregorovitch. Krum says that it was one of the last ones made by him, as he had retired.

Harry continues to have dreams about Voldemort's quest for Gregorovitch, including one in which Voldemort questions, and then kills, a woman who dares to say she doesn't know where he went. Finally, Voldemort reaches Gregorovitch, and questions him regarding some item which he supposedly had. Gregorovitch denies having had it, but Voldemort uses Legilimency to read Gregorovitch's memory of a blond thief who had stolen it from his workshop. We do not see the item that had been stolen. Harry, seeing this memory, believes it must be very small. Having retrieved this memory, Voldemort then kills Gregorovitch.

At the end of the book, it is revealed that the object that Gregorovitch had owned and which had been stolen from him was the Elder Wand or the Deathstick, a legendary wand that could not be defeated in a duel. Ollivander tells Harry that Gregorovitch had spread the rumour that he owned this wand and was examining it to determine its secrets, probably in order to enhance his reputation as a wandmaker. The wand was stolen from him by Gellert Grindelwald.

Analysis
It is telling that Ollivander so quickly recognizes Gregorovitch's work, and that he is so well acquainted with Gregorovitch's history. Hagrid makes a comment in Harry Potter and the Philosopher's Stone that leads us to believe that Ollivander is not the only wandmaker, but certainly the best, though we don't ever learn whether this means the best in the world, the best in Britain, or the best in Diagon Alley. It is true that Ron and Neville both seem to take some pride in having received wands from Ollivander's. Based on that analysis, we can guess that Ollivander is likely at the top of his profession, in London at the very least, and thus his ready knowledge of Gregorovitch and his efforts would indicate that Gregorovitch equally is a master wandmaker for Eastern Europe.