Career
However, her existence has been doubted by some modern Swedish historians that think she was just made up by Charles VIII or his chroniclers to provide him with a more impressive background. lieutenant"s said that she was married to Nils Sixtensson Sparre, a Marshal in Sweden. The title of the book in English is: Notes on Swedish women.
(A biographical dictionary from 1864, covering only Swedish women) In Swedish the page reads: Märtha, dotter af Erik X, som blef gift medical Nils Sixtensson till Tofta, och, genom detta äktenskap, stammoder för Sparreoch Oxenstjerna-slägterna.
English translation: "Martha, daughter of Erik X, who was married to Nils Sixtensson of Tofta, and, through this marriage a progenitress strain for the Sparre and Oxenstjerna families.