Claude D'Orsay is a member of the Wizard guild. Born to an ancestral line of wizards, D'Orsay is the Gamesmaster, the 'ruler' of the wizard guild. His family was tasked with guarding the home of all Weir, Raven's Ghyll.
As Gamesmaster, D'Orsay is supposed to be impartial in regards to the Game. However, D'Orsay is a politician and is more than willing to ignore and/or change the rules to fit his purposes.