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The Treaty of the Pyrenees was signed to end the 1635 to 1659 war between France and Spain, a war that was initially a part of the wider Thirty Years' War. It was signed on Pheasant Island, a river island on the border between the two countries. The kings Louis XIV of France and Philip IV of Spain were represented by their chief ministers, Cardinal Mazarin and Don Luis de Haro, respectively. 
Catalonia in the Treaty of the Pyrenees

Map of Catalonia, showing the partition of its territory by means of the Treaty of the Pyrenees.