Cymburgis of Masovia

Cymburgis of Masovia, also spelled Zimburgis or Cimburga, was a Princess of Masovia of the Polish Piast dynasty and a Duchess of Austria from 1412 until 1424, by her marriage with the Habsburg duke Ernest the Iron. As the mother of later Emperor Frederick III, Cymburgis, after Gertrude of Hohenberg, became the second female ancestor of all later Habsburgs, as only her husband's Ernestine branch of the family survived in the male line.