Helena_of_Oświęcim
Helena of Oświęcim (Polish: Helena Oświęcimska; 1478/80 – after 1524), was a Polish princess member of the House of Piast from the Oświęcim branch and ruling Duchess of Karniów since 1506 until 1523.
She was the only child of Duke Jan IV of Oświęcim by his second wife Barbara, daughter of Duke Nicholas V of Karniów.