- Wojciech Pszoniak as "Mieszko I"
- Marek Bargiełowski as "Czcibór, Mieszko's brother"
- Wanda Neumann as "Dubrawa"
- Franciszek Pieczka as "Mrokota"
- Bolesław Płotnicki as "Siemomysł, Mieszko's father"
- Tadeusz Białoszczyński as "Gero"
- Janusz Bylczyński as "Odo I, Margrave of the Saxon Ostmark"
- Czesław Wołłejko as "Otto I, Holy Roman Emperor"
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