Career
She was the sister of Saint Margaret of Hungary and Saint Kinga (Cunegunda). There, she was encouraged to marry Bolesław the Pious, which she did in 1257. They had three daughters:
Elisabeth of Kalisz (1263 – 28 September 1304).
Married Henry V, Duke of Legnica.
Hedwig of Kalisz (1266 – 10 December 1339). Married Władysław I the Elbow-high, King of Poland.
Anna of Kalisz (born 1278, date of death unknown). A nun in Gniezno
Her husband gave her so much support in her charities that he earned the nickname "the Pious".
She was widowed in 1279.
Following Boleslaus" death, Yolanda and Kinga, along with one of Yolanda"s daughters, Anna, retired to the Poor Clare monastery that Kinga had founded in Sandez. Forced to relocate due to armed conflict in the region, Yolanda founded a new monastery in Gniezno. She was persuaded to become abbess of the community shortly before her death.
She has been declared a candidate for sainthood.
Her sisters, Kinga and Margaret, have already been canonized.