Hedwig of Kalisz (Polish: Jadwiga Boleslawówna; 1266 – 10 December 1339) was the second of three daughters born to Boleslaw the Pious and Saint Yolanda of Hungary. In 1293, Jadwiga married Wladyslaw I the Elbow-high, becoming Queen of Poland. She was the mother of the last Piast King of Poland, Casimir III.