Konrad III Rudy Duke of Masovia (1449-1503) (1449–1503) Parents Barbara Olelkówna Bolesław IV of Warsaw Children Anna of Masovia Sophia of Masovia Stanislaus I of Masovia Janusz III of Masovia Siblings Casimir III of Płock Bolesław V of Warsaw Janusz II of Płock Anna of Warsaw Partners Anna Łoska Magdalena Stawrotówna Anna Radziwill
