Sua Eccellenza si fermò a mangiare is a 1961 Italian comedy film directed by Mario Mattoli and starring Ugo Tognazzi.
[1] In Rome, during the early 30s, a con artist played by Totò impersonates dr. Biagio Tanzarella, Benito Mussolini's personal physician in order to blackmail Ernesto, an unfaithful husband.
Ernesto's wife, Silvia, is very beautiful and charming but he resents her aloofness and has a tryst with an older woman, Lauretta, whom he perceives as more easygoing and desirable.
The false "doctor" at first tries to decline the invitation but, upon hearing that during the banquet offered to the Minister the Bernabei family will use a set of solid-gold tableware chiseled by world-famous Renaissance sculptor and jeweler Benvenuto Cellini, he accepts and brings Lauretta with him pretending her to be his wife; he does so to keep Ernesto from revealing his true identity.
During their stay at the country villa errors and misunderstandings abound with a richness of comedic situations stemming from the intricate web of lies tying the various characters together and from Dr. Tanzarella's relentless efforts to steal the golden tablewares; later the Minister is revealed to have tried, years before, to seduce Lauretta in a train carriage only to suffer an embarrassing sexual defaillance.