In short - what if the only surviving son of Felipe IV of Spain from his first marriage meets his intestinal disorder of doom a little bit later - namely after marriage to Marianna of Austria circa 1648 and the birth of first child, *Margarita-Theresa, in 1649?
Who will Felipe IV remarry now than the Dowager Princess of Asturias is off the cards? Will he go for le grand cliche of Le Grand Mademoiselle? Or somebody else?