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m. Est 1248
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Facts and Events
Konrad II of Czersk (pl: Konrad II czerski; c. 1250 – 24 June/21 October 1294), was a Polish prince member of the House of Piast, Duke of Masovia during 1264-1275 jointly with his brother, after 1275 sole ruler over Czersk and Duke of Sandomierz during 1289. He was the eldest son of Siemowit I of Masovia and Pereyaslava, a Russian princess.
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