Margaret of Masovia

Margaret of Masovia (before 1358 – 14 May 1388/4 April 1396) 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. Margaret was a daughter of Siemowit III of Masovia and his wife Euphemia of Opawa. Her paternal grandparents were Trojden I of Masovia and his wife Maria, daughter of Yuri I of Galicia and Euphemia of Kuyavia. Life In 1369 Margaret married her first husband Casimir IV, Duke of Pomerania, son of Bogislaw V, Duke of Pomerania and Elizabeth of Poland. The marriage was arranged because Casimir was the grandson of Casimir III the Great and was a possible successor for his grandfather (who never had any sons). Therefore, this marriage was a very important alliance and it had been hoped it would possibly introduce the Masovian blood into the Polish royal family. Casimir had been married once before to Johanna of Lithuania, who had died the year before Margaret's marriage, without any children.