Stanislaus I of Masovia

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Janusz III Mazowiecki Stanisław Mazowiecki Anna of Masovia Click on button to enlarge image

Last of the Masovian Piasts: Janusz (1503-1526), Stanisław (1500-1524), Anna (1498-1557)
Last of the Masovian Piasts: Janusz (1503-1526), Stanisław (1500-1524), Anna (1498-1557)

Stanisław Mazowiecki or Stanislaus I of Masovia (1500 – 1524) was a Polish duke of Masovia. Son of Konrad III Rudy. Until 1518 Masovia was under regency of his mother Anna Radziwiłł, afterwards he became its ruler till his death in 1524.

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