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In page Margaret of Masovia:
"Margaret of Masovia Polish: Małgorzata (before 1358 – 14 May 1388/4 April 1396[citation needed]) was Duchess of Pomerania and Brzeg, by her marriages to Casimir IV, Duke of Pomerania and then to Henry VII of Brzeg. She was a member of the House of Piast.
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