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As most people might know, the Capetians and their kin ruled France from the 900s to the 1800s, almost a millennium of Capetian (and Valois and Bourbon, both Capetian cadet branches) rule of France.
Here's a challenge. The POD can be anywhere in history after the Capets have come to the throne.... make the House of Castries rule France.
http://en.wikipedia.org/wiki/House_of_Castries
There's the wiki article about them. How could it come about that they would rule France? Would the Valois and Bourbon houses both have to die out for this to happen? How could this result be achieved?