Bolesław I of Masovia

Bolesław I of Masovia (Polish: Bolesław I Mazowiecki; 1208 – ca. 25 February 1248), was Polish prince 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 whole Masovia during 1247–1248.

Bolesław I
Seal of Boleslaw I of Masovia
Born1208
Diedca. 25 February 1248
Noble familyPiast dynasty
Spouse(s)Gertrude of Silesia
Anastasia Alexandrovna of Belz
FatherKonrad I of Masovia
MotherAgafia of Rus

He was the second son of Konrad I of Masovia and Agafia of Rus. He was probably named after his great-grandfather, Bolesław III Wrymouth. The death of his older brother Przemysł in 1228 left him as the eldest surviving child of his family.

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