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alternatehistory.com
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).