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If you mean Philip II of Spain, his main achievement was stopping the western ambitions and expansion of the Ottoman Empire after annihilating the Ottoman fleet in the battle of Lepanto.

Other effects were consequences of his being the self-proclaimed champion of the Roman Catholic faith: it led to the war with- and his loss and the independence and subsequent rise of the Dutch Republic, and to the failed Armada expedition to England, which had the effect of forcing England's Roman Catholics to go underground with their beliefs for centuries to come and to their not being eligible for any public office until well into the 19th century.

His wars in Italy led to Spain becoming master of a large part of Italy. A brief expedition (more than a war) led to the annexation of Portugal.

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