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John Joseph of Austria or John of Austria (the Younger) (7 April 1629 – 17 September 1679) was a Spanish general and political figure. He was the only illegitimate son of Philip IV of Spain to be acknowledged by the King and trained for military command and political administration. Don John advanced the causes of the Spanish Crown militarily and diplomatically at Naples, Sicily, Catalonia, the Netherlands, Portugal, Dunkirk, and other fronts. Wikipedia