Duke of Masovia
Duke of Masovia was a title borne by the sons and descendants of the Polish Duke Bolesław III Wrymouth. In accordance with the Testament of [Bolesław III Krzywousty|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 Polish monarchs|High Duke of all Poland]. This was known as the fragmentation of Poland. Subsequent developments lead to further splintering of the duchies.
The following is a list of all rulers of the Duchy of Masovia and its parts. Although not all incumbents listed here had titular rights to the title of Duke of Masovia, they are all listed as such for simplicity's sake.
Also take note that some of the dates are merely approximate and the ownership of certain lands might be disputed. Finally, this table does not include lands ruled by dukes of other parts of partitioned Poland or Wenceslaus II and Wenceslaus III.