Dr. Richelieu (pronounced Reesh-loo), played by Edward Hibbert, is the head marriage counselor of a marriage retreat/water park in "Love Conquers Al".
Al Bundy and Peggy Bundy go to after it is recommended by Jefferson D'Arcy and Marcy D'Arcy. It becomes apparent that Jefferson was brainwashed, but Al quickly cures him with a dirty magazine. Al and Peggy go anyway with Peggy's Mother and Ephraim Wanker in an attempt to repair their failing marriages.
Despite Dr. Richelieu's therapy of singing "Kumbaya, My Lord" and "trust exercises", no one at the retreat makes any progress in their marriages. Al quickly takes over and advises the husbands to let their wives blame them for everything, which fixes everyone's marriage except Ephraim and Peggy's mother. Dr. Richelieu shows an intense dislike for Al for interfering with his work as the "prophet of love", as he put it. Ephraim takes one of the other wives at the retreat with him on a cruise around the world, leaving Peggy to beat up Al with a foam bat as the others sing Kumaya with Dr. Richelieu.
The character's name is derived from the title of Armand Jean du Plessis (1585-1642), who, as cardinal-duc de Richelieu at de Fronsac, was a great power in the court of King Louis XIII, and the main antagonist of Alexandre Dumas' "The Three Musketeers".