Duke of Masovia was a title borne by the sons and descendants of the Polish Duke Bolesław III Wrymouth. In accordance with the last will and testament of Bolesław, upon his death his lands were divided into four to five hereditary provinces distributed among his sons, and a royal province of Kraków reserved for the eldest, who was to be High Duke of all Poland. This was known as the fragmentation of Poland. Subsequent developments lead to further splintering of the duchies.
Image: Michał Stachowicz Salomea of Berg
Image: Jan Matejko, Bolesław IV Kędzierzawy
Image: Kazimierz 2 Sprawiedliwy
Image: Jan Matejko, Leszek Biały
The House of Piast was the first historical ruling dynasty of Poland. The first documented Polish monarch was Duke Mieszko I. The Piasts' royal rule in Poland ended in 1370 with the death of King Casimir III the Great.
Deeds of the Princes of the Poles
Image: Mieszko Dagome
Image: Chrobry 1
Image: Mieszko II