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Has any noble or royal in Western Europe (count Hapsburgs as the east most) ended up marrying their heir presumptive? Or alternately, has a consort for (insert title) ended up becoming the heir presumptive due to untimely deaths before the couple had a kid (in which case that kid obviously becomes the heir, unless it's a seniority succession which is not western Europe sounding to me). I would imagine the only case being something like a ruler from a family dearth of branches in the known royal family or something like that, so the next heir is a distant relative.
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