Mr. Pelletan's rascal son Bébert son got another F for playing in class. His punishment is an essay on the Merovingian king Dagobert. All they know is he had eight wives and reunited Francia. The ignorant knave's irreverent imagination turns that into a harem and a ludicrous war without armies, loaded with anachronisms, in a race against rival king Charibert for the crown of Reims. The king's right hand, archbishop Eloi, the later patrons saint of carpentry, is portrayed as an inventor.
Fernandel
as M. Pelletan / Le roi Dagobert
Gino Cervi
as Saint Éloi
Darío Moreno
as Charibert
Marthe Mercadier
as Mme Pelletan / Gomatrude
Jean Tissier
as Le grand connétable
Michel Galabru
as Pépin
Pierre Doris
as Césaric la Crapule
Georges Lycan
as L'espion de grande taille
Henri Virlogeux
as L'instituteur
Max Amyl
as Le père supérieur
Alain Morat
as Bébert / Sigisbert
Rivers Cadet
as Un faux pélerin
