alternatehistory.com

I'm reading "The two Georges" of Turtledove & Dreyfuss,and like it very much.
My question is would have been possible,in XVIII century (or in a early XIX century timeline without French revolution) a "personal union" http://en.wikipedia.org/wiki/Personal_union between Kingdoms of France and Spain under a single Bourbon dinasty,like the "Holy Alliance of the book?
Top