William Clito marries Matilda

King William I of England died in 1087.
His eldest son Robert became Duke of Normandy. Robert's son was William Clito.
Robert's brother Henry had a daughter Matilda.

Suppose William Clito marries Matilda. What happens then?
 
War with France intensifies as Clito and Matilda unite England, Normandy and Flanders, thus 1) depriving both of their Angevin matches, with significant butterflies for Anjou's own politics and Franco-Angevin relations/cooperation against Normandy and 2) no doubt strengthening French support for rival candidates in Flanders(/general interference in the Low Countries) and perhaps in Normandy-England (if anyone decided to take the Champagne-Blois brothers' claims seriously).

England profits from no Matilda-Stephen conflict but unless Clito is a very competent King it'll be a difficult reign with foes on all sides wanting to tear apart the union.

A Papal dispensation would also be necessary.
 
I can't see it happening, I'm afraid.

1) They're too closely related at the time, so they will at least require Papal dispensation.

2) William Clito is too young to marry when Matilda has her first marriage in 1114, so he'll have to be wait until 1125. At that point, Clito is not just a rebellious Norman, he's a defeated rebellious Norman.

3) William Clito is not popular with the Anglo-Norman barons, who are quite fond of their independence from the French crown, which William poses a threat to, having pretty much been Louis VI's pet since 1190 (this was a problem they Anglo-Norman barons had with Matilda's OTL husband Geoffrey).

Henry I gains little from having his daughter marry Matilda. I suppose it perhaps means he can name William as his successor, rather than Matilda, and thus secure his line upon the throne. But what he (and Matilda) gained from the marriage to Geoffrey d'Anjou is making an ally out of a former Norman enemy, Anjou's massive tracts of land, and their armies.

If it were to happen: the Anglo-Norman barons would invite Theobald or Stephen of Blois to take the throne. Without the land and arms of Anjou behind them, Theobald or Stephen win, establishing the House of Blois on the throne of England.
 
Close cousin marriage seems to have been uncommon but was hardly unprecedented when political expediency demanded it. The Conqueror and Matilda of Flanders married despite a Papal ban, for example, and Eleanor of Aquitaine was a cousin (distant, but within the church's prohibited degrees) of both her husbands.

The best POD for this union to happen is greater success for Clito's second Norman expedition. If he avails himself well militarily and is a real problem, Henry might be more inclined to bring him on board and make him heir (jure uxoris). Alternatively Clito could kidnap Matilda on her way back from Germany: her hand in marriage and the jewels etc she brought with her would make quite the dowry for a princeling in exile.

I have no doubt Clito would forego his French connection as soon as uncle Henry welcomed him back into the family (and line of succession).
 
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