Siemowit I of Masovia
Polish duke · Lived 1215 to 1262 · aged 47
Siemowit I of Masovia, was a Polish prince member of the House of Piast, Duke of Czersk during 1247-1248, Duke of Masovia during 1248-1262, ruler over Sieradz during 1259-1260.
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Lived 1215 to 1262 · aged 47