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Hedwig of Masovia (Polish: Jadwiga mazowiecka, Hungarian: Hedvig mazóviai hercegnő; ca. 1392 – after 19 February 1439), was a Polish princess, member of the House of Piast in the Masovian branch.
She was the eldest daughter of Siemowit IV, Duke of Masovia and Alexandra, a daughter of Algirdas, Grand Duke of Lithuania and sister of King Władysław II Jagiełło of Poland.