Konrad III Rudy

Konrad III Rudy (Konrad III the Red or Konrad III of Masovia) (1448 – October 28, 1503) 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.

Son of Bolesław IV Warszawski, married to Anna Radziwiłł, father of the last Masovian Piasts: Janusz (1503–1526), Stanisław (1500–1524), Anna (1498–1557). By his wife he had another daughter, Sophia who married Stephen VII Báthory. He had three illegitimate sons:

• Stanisław (with Dorota from Warsaw)
• unknown (with Dorota from Warsaw)
• Hieronim (with Anna Łoska) [1].