On October 7th, 1571, the Holy League which was an alliance of the Papal State, Venice, Spain and Genoa, decisively defeated the Turkish fleet at the Battle of Lepanto at the Gulf of Corinth. John of Austria, the illegitimate son of Emperor Charles V of Spain, commanded the impressive fleet of galleys.
Pope Pius V promoted the Holy League for fear of the aggressive advance of the Turkish army deeper into Europe and their attempt to control the Mediterranean Sea. The Turks had already vanquished the Christian Empire in the east having taken Constantinople in 1453. Western Europe united to halt their advance and their victory at Lepanto was seen as divinely assisted. The victory however was short lived, the Turks soon built up a new fleet and continued to advance towards Europe.