Elisabeth of Kalisz was the eldest child of Boleslaw the Pious and his wife, Saint Jolenta of Poland.
Background
In 1273, Elisabeth married Henry V, Duke of Legnica (1248–1296), who was the son of Bolesław II the Bald and Hedwig of Anhalt. Hedwig (b ca 1277 – d aft 3 February 1347), married by 1289/95 to Prince Otto of Brandenburg-Salzwedel, second son of Margrave Otto V. After her husband died, she became a nun in Saint Klara, Wroclaw.
Career
Her younger sister was Jadwiga of Greater Poland. Jadwiga was married to Władysław I the Elbow-high They had many children - among them were Elizabeth of Poland and Casimir III the Great.
Following Bolesław"s arrival in the Bohemian court and after his betrothal to Margaret, the King clearly favored him.
This attitude caused fear among the closest male relatives of the King, who saw the young Duke of Legnica as a potential rival for the throne. Bolesław began his fight for the Bohemian throne taking the title of "haeres Regni Poloniae" (heir of the Polish Kingdom).
Bolesław and Margaret were married in 1308 and had three children. By this time, Elisabeth had died.