Stanislaus I of Masovia
Encyclopedia
Dukes of Masovia
The Dukes of Masovia were a line of the Piast dynasty who ruled in Masovia. The following is a list of all rulers of the Duchy of Masovia and its parts...
. Son of Konrad III Rudy
Konrad III Rudy
Konrad III Rudy was a Polish duke of Masovia.He reunited most of Masovia still not controlled by Kingdom of Poland, including Płock, Płońsk, Czersk, Wyszogród and Warsaw....
. Until 1518 Masovia was under regency
Regent
A regent, from the Latin regens "one who reigns", is a person selected to act as head of state because the ruler is a minor, not present, or debilitated. Currently there are only two ruling Regencies in the world, sovereign Liechtenstein and the Malaysian constitutive state of Terengganu...
of his mother Anna Radziwiłł, afterwards he became its ruler till his death in 1524.