The Triple Alliance of 1596 (full title: Tract of alliance between England, France and the United Netherlands), was an alliance between England, France and the Republic of the Seven United Netherlands. The Republic joined as a third party to an earlier agreement between England and France, but the alliance did in fact not take effect until the Republic joined. By signing the treaty, France and England were the first states to recognize the Republic of the Seven United Netherlands as an independent state. The three parties in the alliance were all at war with Spain. There had been attempts to convince magnates from the Holy Roman Empire to join the alliance, but they did not want to enter the war against Spain. The alliance, along with other things, agreed to help maintain their respective armies. The alliance was in effect for only a few years.
Elizabeth I had become queen of England in 1558. She was the successor of Mary I of England, who had conducted a reign of terror against Protestants in an attempt to restore the Catholic Church in England. Mary had married Philip II, the king of Spain in her final years. Elizabeth I supported Protestants and over time began to see the Catholics as potential enemies and supporters of Philip II.
From the mid eighties of the 16th century, England openly supported the revolt in the Netherlands, which started in 1568. Relations between Spain and England had long been tense. These tensions led to the breakout of the Anglo-Spanish War in 1585, and resulted in the destruction of the Spanish fleet and the failed invasion of England by the Spanish Armada in 1588. Since then Spain spent considerable effort to rebuild its fleet. Elizabeth's strategy was to destroy any new Spanish ships before they could take any action. Following this strategy, a combined Anglo-Dutch fleet successfully attacked the Spanish fleet at Cádiz, where, amongst other results, two Spanish warships were captured.