Monsignor

Louis Mennechain is a modest locksmith. So imagine his amazement when Professor Piétrefond approaches him and tells him he recognizes in him a descendant of the kings of France, more precisely of Louis XVII (the king who never reigned). According to him he is none other than the monarch's great grandson. Louis's life is soon turned upside down as he becomes the center of attention of a group of ardent royalists. Even a duchess "gives" him her love to make sure that he accepts his role as pretender to the throne...

Bernard Blier

Louis Mennechain

Fernand Ledoux

Piétrefond

Yves Deniaud

Bellare

Nadia Gray

The Duchess of Lémoncourt

Marion Tourès

Anna

Paul Frankeur

The stallholder

Gabriel Gobin

Tatave

Jeanne Lion

Mrs. de Ponthieux

Paul Faivre

General de Lormaux

Richard Francoeur

The head waiter

Georges Tourreil

The Marquis

Roger Weber

Léon Walther

The butler

Maurice Escande

The Duke of Saint Germain

Sylviane Aladin

(uncredited)

Josée Ariel

(uncredited)

Charles Bayard

A guest (uncredited)

Édouard Francomme

A man at the fair (uncredited)