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One of the biographies of Rupert of Rhine I've read online notes that in 1638 his mother attempted to marry the young man off to Margot de Rohan, the richest adult heiress in France and second richest heiress in France in general, the only heir to elder branch of the House of Rohan.
In OTL the marriage proposal came to naught, Rupert remained single\in civil union by the end of his life\, Margot married to a nobleman way below her rank... but what if the young people took liking to each other?

The most obvious butterfly from the match is that Rupert (or Duc Robert de Rohan, Prince Palatine of Rhine) likely won't be able to participate in English Civil War, being a French general. Though his participation in 30 Years War will likely differ from OTL (no Linz imprisonment?).
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