After a fall from a horse, a 20th-century nobleman remains convinced that he is Henry IV, Holy Roman Emperor in the 11th century. For more than twenty years, his family indulge his madness, until his nephew and former companions decide to cure him once and for all. But their attempt reveals a reality far more destabilizing and tragic than they could have imagined.
| Actor | Role |
|---|---|
 Romolo ValliEnrico IV | Enrico IV |
 Gianna GiachettiLa marchesa, Matilda di Spina | La marchesa, Matilda di Spina |
| MMariella FenoglioFrida | Frida |
| PPino LuongoIl giovane marchese, Carlo di Nolli | Il giovane marchese, Carlo di Nolli |
| MMino BelleiIl barone, Tito Belcredi | Il barone, Tito Belcredi |
| AAdolfo GeriIl dottore, Dioriso Genoni | Il dottore, Dioriso Genoni |
| GGabriele TorriLandolfo | Landolfo |
| GGianfranco MariArialdo | Arialdo |
| GGianni FeliciOrdulfo | Ordulfo |
 Gino PerniceBertoldo | Bertoldo |
| GGualtiero IsnenghiIl vecchio cameriere, Giovanni | Il vecchio cameriere, Giovanni |
| CCesare Guerraprimo valletto | primo valletto |
| AAlessandro Festasecondo valletto | secondo valletto |