Doctor Caius is a French physician, a short-tempered, easily offended man who is wooing Anne Page and does not wish to see anyone else moving in on her.
Quick to judgment, he assumes that Evans is hoping to marry Anne himself, and immediately challenges the Welshman to a duel. Dr. Caius has an extremely heavy French accent and is not fully in command of English, which cannot be helped by the fact that his housekeeper is Mistress Quickly, herself not the best user of the language. Mistress Page supports him as Anne’s husband, and tries to arrange for him to run off with her during the final prank on Falstaff. Unfortunately for him, he is tricked by the girl herself, and ends up being married to a boy. As the local doctor and a man well-connected with the court, he is a respected citizen, despite his bad English and his choleric ways.