Janusz I of Warsaw

Polish noble (1347–1429)

Parents

• Euphemia of Opava
• Siemowit III, Duke of Masovia

Children

• Konrad Januszowic
• Bolesław Januszowic
• Janusz the Younger

Siblings

• Margaret of Masovia
• Henry of Masovia
• Siemowit IV
• Euphemia of Masovia
• Stanisław Siemowit of Masovia

Partners

• Danutė of Lithuania