Who married Helena Korybutówna?

Helena Korybutówna (ur. przed 1390, zm. po 2 marca 1449) – księżna raciborska, córka księcia Nowogrodu Siewierskiego Korybuta Dymitra i Anastazji riazańskiej.

John II, Duke of Opava-Ratibor (also known as John II of Troppau or John the Iron; Czech: Jan II. Opavský or Hanuš Ferreus; after 1365 – 1424) was Duke of Opava-Racibórz (Ratibor), Krnov and Bruntál. From 1388 to 1397, he was also governor of Kłodzko and Ząbkowice Śląskie and from 1397 to 1422 pledge lord of Kłodzko and Ząbkowice Śląskie. He was a member of the Opava branch of the Přemyslid dynasty.