AHC: House of Coucy survives till mid-17th century

Inspired by... The Three Musketeers of all things.
We all know that Alexander Dumas-Pere played fast and loose with history, sometimes venturing into actual alternate history when it suited him.
For example, he left enough hints for the knowledgeable readers than Athos was a Coucy (Comte de La Fere title, names "Enguerrand" and "Raoul" used in his family frequently). So in Dumas-verse the last legitimate male Coucy died in 1662 and not in 1397.
http://en.wikipedia.org/wiki/Enguerrand_VII,_Lord_of_Coucy
In OTL this guy was the last Coucy.

So the challenge is to predict how this guy leaving male heir in either one of his marriages and the lineage of those surviving into the Sun King times will affect the events of French (and probably English) history.
It seems that in Dumas-verse House of Coucy suffered the same fate as House of Montmorency OTL - the main title became lost/passed in female line while cadet branch survived as House de La Fere (compare Montmorency and Montmorency-Boutville situation).
 
Bump - also not much of a challenge, but more likely of WI (based on hints and stipulations provided by Dumas), as it will just involve Enguerrand VII leaving legitimate male child(-ren) with one of his wives.
But how will continued Coucy line affect Hundred Years War/War of Roses etc.?
 
Wow, I expected this to come out of Tuchman instead of Dumas.

The obvious question to ask first: which wife gives him male issue? Because that's going to make a big difference; a son by Isabella of England is more likely to get swept up in English politics, while his second wife will likely be more involved in French politics. For that matter, an early son by his English wife might leave Enguerrand himself more aligned with England, instead of France as OTL.
 
Well, allowing one of Enguerrand VII's daughters by Isabella of England (if you want it to affect the War of the Roses) to be born a son might make for interesting fodder when it gets to the wars, since Isabella's the eldest daughter of Edward III, they might prove an interesting fifth column if those wars still happen.

For more immediate results, letting his daughter by Isabelle of Lorraine be a son might lead to a civil war in Lorraine when Charles II dies without a male heir.

From what I understand of it, the duc d'Orléans forced/bribed/coerced Marie I (Enguerrand's daughter by Isabella of England) into parting with several properties, and she spent some time in court and lawsuits lobbying for it to be returned to her. This was unsuccessful and the seigneurie of Courcy was absorbed into crown lands.
 
One of the things discussed is that if he is the father of a grandchild of Ed.III, the Coucys are set up as alternate ducs d'Aquitaine/de Normandie. Would England (even if the Coucys renounce their claim to England) still accept that they would lose their lands in France?
 
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