Who is Chauvelin in The Scarlet Pimpernel?

Citizen Chauvelin is the villain of Baroness Emmuska Orczy's play and novel, The Scarlet Pimpernel. He is the enemy of Sir Percy Blakeney and the League of the Scarlet Pimpernel. He is a member of the National Assembly as well as the Committee for Public Safety, and as a fierce patriot, he wants to punish the Scarlet Pimpernel for helping members of the ancien regime nobility escape the fallout of the French Revolution. Chauvelin comes to suspect Blakeney's involvement with the League and blackmails his wife, Marguerite, after finding that her brother had close ties to the Pimpernel. Though she tries to protect her brother and husband from Chauvelin, she mistakenly leads him to finding out that Blakeney is, in fact, the Scarlet Pimpernel. Chauvelin chases Blakeney to Calais, where he intends to capture him, but the man escapes to safety in England.