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In page Family of Vladimir the Great:
"It is believed that the only child of this alliance was Dobronega, or Maria, who married Casimir I of Poland between 1038 and 1042. As her father Vladimir died about 25 years before that marriage and she was still young enough to bear at least five children, including two future Polish dukes (Bolesław II of Poland, who later became a king, and Wladyslaw Herman), it is thought probable that she was Vladimir's daughter by the last marriage.[citation needed]
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