Who was Gustav's illegitimate son mother?

+4 votes
I found the following info:

"Count Gustaf [Fredrik] Oxenstierna af Södermöre, born 29 March 1609, died unmarried 1629 in Prussia from the plague, buried Jäder church. He may have had illegitimate issue as follows, by N. N. Pasternack"

His son - Theodor Pastenaci, born about 1628 at Nordenburg - is a head of my family, so I wonder who was a "grand" mother.

Best Regards,

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