A fact from Marie Casimire Sobieska appeared on Wikipedia's Main Page in the Did you know column on 22 August 2006. The text of the entry was as follows:
Did you know... that Maria Kazimiera, the 17th-century Queen of Poland, became famous for the love letters she and her husband, King Jan III Sobieski, wrote to each other?
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The ancestry of Marie Casimire Louise as shown in the traditional source references, has been challenged recently. A brief summary of the 2019 Sjöström hypothesis is as follows:
The name of Casimire (Kasimira) is not one that is used in France at that time. It is a Polish name, indicating the probable paternal origins.
The Polish prince, Jan Casimir, a younger brother of the Polish King, was travelling in Provence etc, and was taken prisoner (in 1639 or so) by Richelieu's administration. He was held for some years in Paris effectively in home arrest, so was able to move around the area and possibly had an affaire with the spinster Louise Marie of Nevers, a lady in her 20s at the time.
The hypothesis suggests that Louise Marie of Nevers fell pregnant by her affaire with the Polish Prince, and moved to her family castle in Nevers, with the couple Arquien who were her supporters. The resultant baby was hidden and appeared to be a child of the Arquien couple.
When Louise Marie of Nevers later accepted the proposal of marriage of her affaire's elder brother the then Polish King, it is recorded that she takes her baby girl with her, the Arquien couple thus giving up the child.
Later, when Jan Casimir has abdicated the Polish throne, his daughter Marie Casimire Louise, married to husband Sobieski who becomes King, effectively continues the blood of the old dynasty. This would have been understood by the Polish court." 2001:14BA:4857:A000:C93E:5402:B7BC:3AAD (talk) 03:03, 8 September 2023 (UTC)Reply
