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In page Catherine of Bosnia, Countess of Cilli:

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It is known that Catherine was of Bosnian origin, but her parentage is disputed. Some believe that Catherine was the daughter of Vladislav Kotromanić and his wife Jelena Šubić. Others[citation needed] believe she was the second daughter of Stephen II, Ban of Bosnia, and his third wife Elizabeth of Kuyavia. If Catherine was a daughter of Stephen, she was the sister of Queen Elizabeth of Hungary; if she was a daughter of Vladislav, she was sister of King Tvrtko I of Bosnia.