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In 1539 Isabella of Portugal, wife of Emperor Charles V, died. Charles never remarried. Supposedly he did this out of his deep love of his wife. Now what if he had been persuaded to take a second wife to help secure the succession (Charles only had one son, Philip II). Now who would this be? And how would this effect history? Would Charles divide his empire into further pieces, giving the Burgundian inheritance to a son by his second wife? How could this effect the Habsburg succession? If this second Spanish line effect a war of succession?

Here's the possible wives I found for Charles V​

Mary of England- Charles' first cousin, daughter of Henry VIII and Catherine of Aragon. Could cement an alliance between England, Spain and the Empire
Margaret of France-youngest daughter of Francis I, could be used to cement peace with France
Elisabeth of Austria- Daughter of Charles' brother Ferdinand,
Maria of Portugal-daughter of his sister Eleanor by Manuel I of Portugal.
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