G2G: Birth Certificate of Robert (aka Pierre Robert) de Lavoye Namurs

Question

Pre 1700 Expertise Please

I would appreciate help finding the birth certificate and other sources in order to connect of Robert (aka Pierre Robert) Lavoye Namours (1577-1661) to his parents - Giacomo/Jacques des Savoie (1531-1585) & Anna d'Este. (1531-1607).

I want to identify the correct parents, Giacomo/)Jacques de Savoie & Anna d'Este, as stated on Family Search:

Wiki IDs
Giacomo/Jacques possible Wiki ID: De_Savoie-124
Father: De_Savoie-124
Mother: Este-9

The Family Search Links are:
Pierre Robert
https://ancestors.familysearch.org/en/L64M-WQ8/pierre-robert-de-lavoye-nemours-1577-1661
Father
https://ancestors.familysearch.org/en/G7WW-HYB/jacques-de-savoie-nemours-1531-1585
Mother
https://ancestors.familysearch.org/en/G9TX-C63/anne-d%27este-ferrare-modena-duchess-consort-of-guise-and-nemours-1531-1607

Comments

Was the connection made? FamilySearch popped up a "you're related to Marie Antoinette" post to me that ties De La Voyes from France to those in Quebec. I can't figure out whether that's speculative or known. More interested in Anne d'Estes than Marie Antoinette now that this has come onto my radar. But I have no idea how to verify.

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There are a few explanations below. 

From my research I was wondering if Robert de la Voye was the same person as Robert Savoy (1577-1660).  If so, Robert is a descendant of Jacques Savoy & Anna D'Este. Their 3rd GGS, Chas Savoy III (1701-1773) married Marie Antoinette's brother, Franz Etienne de Lorraine (1708-1765).

https://www.wikitree.com/index.php?title=Special:Connection&action=connect&person1Name=Este-9&person2Name=Habsburg-Lothringen-1&relation=0&ignoreIds=

Is this what you're asking?

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Thank you but not quite. FamilySearch sent me a message that Regne de Lavoye was a son of Robert de LaVoye who was a son of Anne d"Este, and through her made Marie Antoinette a very distant cousin. I was trying to find out how someone discovered that Regne was Anne's grandchild, whether there were documents that went from Regne to Robert to Anne. At this point, it looks like someone just guessed.

Answer 1

I found Anne d'Estes last will (link below) and in the will it states that Henri was her youngest son.   Given it is her will, I wonder if it means that if Robert is a son of Jacques that it was out of wedlock.   Or is there another explanation?

Anne last will link:

https://cour-de-france.fr/vie-quotidienne/gestion-materielle-et-inventaires/ouvrages-avant-1800/article/extrait-de-l-inventaire-apres-deces-d-anne-d-este-1531-1607?lang=fr

Savoie illegitimate children book:

https://books.openedition.org/irhis/1215