Siemowit IV

Duke of Masovia (1352–1426)

Parents

• Euphemia of Opava
• Siemowit III, Duke of Masovia

Children

• Maria of Masovia
• Aleksander Mazowiecki
• Trojden II of Płock
• Cymburgis of Masovia
• Catherine of Masovia
• Jadwiga of Masovia
• Amelia of Masovia
• Siemowit V of Masovia
• Władysław I of Masovia
• Casimir II of Masovia
• Euphemia of Masovia
• Anna of Masovia

Siblings

• Euphemia of Masovia
• Janusz I of Warsaw
• Henry of Masovia
• Margaret of Masovia
• Stanisław Siemowit of Masovia

Partners

• Alexandra of Lithuania