Bolesław I of Masovia (Polish: Bolesław I Mazowiecki; 1208 – ca. 25 February 1248), was a Polish prince, a member of the Polish House of Piast, Duke of Sandomierz (only a part) during 1229–1232, Duke of Dobrzyń during 1233–1247 and Duke over the whole Masovia during 1247–1248.
Bolesław I of Masovia (Polish: Bolesław I Mazowiecki; 1208 – ca. 25 February 1248), was a Polish prince, a member of the Polish House of Piast, Duke of Sandomierz (only a part) during 1229–1232, Duke of Dobrzyń during 1233–1247 and Duke over the whole Masovia during 1247–1248.
Source: Wikipedia "Bolesław I of Masovia" · CC BY-SA 4.0
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