Constantia Eriksdotter (1560–1649) was the illegitimate daughter of Eric XIV of Sweden and Agda Persdotter.
Constantia Eriksdotter and her sister Virginia were removed from their mother's custody when she married in 1561.
This was illegal, as according to the law the mother had sole custody until the children reached the age of three.
On 13 January 1594, she married the English nobleman Henry Frankelin, courtier to her uncle Charles IX of Sweden.
The same year, she was awarded nine estates in Väne parish in Bohuslän by her cousin king Sigismund III Vasa.