Could refer to Gellert Grindelwald of the Harry Potter books, most likely the sexiest fucking beast to walk this earth. He was a dark wizard who believed in Wizard Supremacy. He is dead, but WAS taken by the second sexiest bloke ever, Albus Dumbledore. He wore fancy clothes and did fancy things...to Albus of course ;D
Also could refer to a stupid-ass whore neopet. Who stole Grindelwald's name. I don't care which came first. FUCK YOU, NEOPET! DIE IN A HOLE.
"CRUCIO!" cried Gellert as he attacked his idiotic copy-cat neopet.