Her parents were Rostislav Mikhailovich, future ruler of Belgrade and Slavonia, and his wife Anna of Hungary.

Kunigunda was married – as a token of alliance from her maternal grandfather Béla – to King Ottokar II of Bohemia (ca.

Ottokar was paternally a member of the Přemyslid dynasty whose marriage to Margaret, Duchess of Austria (ca.

He made allies and collected a large army, but he was defeated by Rudolph and killed at the Battle of Dürnkrut and Jedenspeigen on the March on 26 August 1278.

Kunigunda's son Wenceslaus II kept the Kingdom of Bohemia, and also succeeded in obtaining Poland and Hungary although not very sustainably.