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m. Est 1248
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Siemowit I of Masovia (c. 1224/28 – 23 June 1262), was a Polish prince member of the House of Piast, Duke of Czersk during 1247-1248, Duke of Masovia (except Dobrzyń) during 1248-1262, ruler over Sieradz during 1259-1260. He was the sixth son of Konrad I of Masovia and his wife Agafia of Rus. He was named after his older brother Siemowit, who died young in 1224.[1]
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