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Jadwiga (born 1373/74—died July 17, 1399, Kraków, Poland; canonized June 8, 1997; feast day February 28) was the queen of Poland (1384–99) whose marriage to Jogaila, grand duke of Lithuania (Władysław II Jagiełło of Poland), founded the centuries-long union of Lithuania and Poland. Jadwiga was the daughter of Louis I, king of both Hungary and Poland, and Elizabeth of Bosnia. After Louis died on September 11, 1382, his elder daughter, Maria, was elected queen of...