During her reign Kinga got involved in charitable works such as visiting the poor and helping the lepers. When her husband died in 1279, she sold all her material possessions and gave the money to the poor. She soon did not want any part in governing the kingdom which was left to her, and decided to become a Poor Clarenun in the monastery at Sandec (Stary Sącz). She would spend the rest of her life in contemplative prayer and did not allow anyone to refer to her past role as Grand Duchess of Poland. She died on 24 July 1292, aged 68.
Legend has it that Kinga threw her engagement ring into the Aknaszlatina salt mine in what was then Hungary. The ring miraculously traveled along with salt deposits to Wieliczka, where it was rediscovered. On this spot the miners erected a statue of Saint Kinga, carved entirely from salt, which is 101 meters under the Earth's surface.[9]
Kristó, Gyula (2003). Háborúk és hadviselés az Árpádok korában [Wars and Tactics under the Árpáds] (in Hungarian). Szukits Könyvkiadó. ISBN963-9441-87-2.
Klaniczay, Gábor (2002). Holy Rulers and Blessed Princes: Dynastic Cults in Medieval Central Europe. Cambridge University Press. ISBN0-521-42018-0.