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In page Elizaveta Ostrogska:

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In 1555 the King of Poland, Sigismund II Augustus, forced Halszka to marry Łukasz Górka, voivode of Poznań, Kalisz, Łęczyca and Brześć Kujawski.[1] This happened again against her and her mother's will, as Beata wanted Halszka to marry Siemion Olelkowicz, Prince of Slutsk.[1] Both mother and daughter fled to Lviv and hid in the Dominican Church.[1] Prince Siemon slipped into the church dressed like a beggar[citation needed] and secretly married Princess Ostrozka in March 1559.[2] The King however didn't recognize it and issued a royal mandate ordering Prince Siemon to give Elizaveta back to Górka. The church was besieged, and mother and daughter were forced to surrender and accept the King's will.[3]