Who is M'sieur Pierre from Invitation to a Beheading and what is their importance?

M'sieur Pierre is the executioner who is supposed to chop off Cincinnatus's head. At first, Pierre pretends to be a prisoner in order to befriend Cincinnatus and lure him into complacence on the chopping block. Pierre is a childish and self-centered man. His hobby is photography, but he only takes photographs of himself. He boasts and brags at every possible moment. He gets angry when Cincinnatus begins to beat him at chess and childishly takes back his previous moves, finally overturning the chess pieces when he finds he cannot defeat his opponent.