Radslav the Zlican
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Radslav the Zlican was a Duke of Kourim, who, according to legend, waged war against Duke Wenceslas I of Bohemia. Wenceslas challenged him to a personal duel, but Radslav saw two angels beside Wenceslas and didn't hurt him. He returned to Kourim with his army.
Radslav is a semi-legendary person, maybe the brother of Vok, Slavnik's mythic father.