[2] Negotiations were conducted and the treaty was signed on Pheasant Island, situated in the middle of the Bidasoa River on the border between the two countries, which has remained a French-Spanish condominium ever since.

It was signed by Louis XIV of France and Philip IV of Spain, as well as their chief ministers, Cardinal Mazarin and Don Luis Méndez de Haro.

An Anglo-French alliance was victorious at the Battle of the Dunes on 14 June 1658, but the following year the war ground to a halt when the French campaign to take Milan was defeated.

On the western Pyrenees a definite borderline was drawn and decisions made as to the politico-administrative affiliation of bordering areas in the Basque region—Baztan, Aldude, Valcarlos.

All in all, by 1660, when the Swedish occupation of Poland was over, most of the European continent was at peace (though the third stage of the Portuguese Restoration War would soon begin), and the Bourbons had ended the dominance of the Habsburgs.