Holy League (1571) in the context of "Naupactus"

The Battle of Lepanto was a naval engagement that took place on 7 October 1571 when a fleet of the Holy League, a coalition of Catholic states arranged by Pope Pius V and led by the navies of the Republic of Venice and the Spanish Empire, inflicted a major defeat on the fleet of the Ottoman Empire in the Gulf of Patras. The Ottoman forces were sailing westward from their naval station in Lepanto (the Venetian name of ancient Naupactus – Greek Ναύπακτος, Turkish İnebahtı) when they met the fleet of the Holy League which was sailing east from Messina, Sicily.

Lepanto marks the last major engagement in the Western world to be fought almost entirely between rowing vessels, namely the galleys and galleasses, which were the direct descendants of ancient trireme warships. The battle was in essence an "infantry battle on floating platforms". It was the largest naval battle in Western history since classical antiquity, involving more than 450 warships. Over the following decades, the increasing importance of the galleon and the line of battle tactic would displace the galley as the major warship of its era, marking the beginning of the "Age of Sail".

The Fourth Ottoman–Venetian War, also known as the War of Cyprus (Italian: Guerra di Cipro; Ottoman Turkish: سفرِ قبرص, romanized: Sefer-i Kıbrıs) was fought between 1570 and 1573. It was waged between the Ottoman Empire and the Republic of Venice, the latter joined by the Holy League, a coalition of Christian states formed by the pope which included Spain (with Naples and Sicily), the Republic of Genoa, the Duchy of Savoy, the Knights Hospitaller, and the Grand Duchy of Tuscany.

The war, the pre-eminent episode of Sultan Selim II's reign, began with the Ottoman invasion of the Venetian-held island of Cyprus. The capital Nicosia and several other towns fell quickly to the considerably superior Ottoman army, leaving only Famagusta in Venetian hands. Christian reinforcements were delayed, and Famagusta eventually fell in August 1571 after an 11-month-long siege. Two months later, at the Battle of Lepanto, the united Christian fleet destroyed the Ottoman fleet, but was unable to take advantage of this victory. The Ottomans quickly rebuilt their naval forces and Venice was forced to negotiate a separate peace, ceding Cyprus to the Ottomans and paying a tribute of 300,000 ducats.

John of Austria (German: Johann von Österreich, Spanish: Juan de Austria, often called "Don Juan" in English but he is not the fictional rake); 24 February 1547 – 1 October 1578) was the illegitimate son of Charles V, Holy Roman Emperor. Charles V recognized him in a codicil to his will. John became a military leader in the service of his half-brother, King Philip II of Spain, Charles V's heir, and was addressed as a Don. He is best known for his role as the admiral of the Holy League fleet at the Battle of Lepanto and as Governor of the Spanish Netherlands.

Alexander Farnese (Italian: Alessandro Farnese, Spanish: Alejandro Farnesio; 27 August 1545 – 3 December 1592) was an Italian noble and military leader, who was Duke of Parma, Piacenza and Castro from 1586 to 1592, as well as Governor of the Spanish Netherlands from 1578 to 1592. Nephew to King Philip II of Spain, he served in the Battle of Lepanto and the subsequent campaigns of the Holy League against the Ottoman Empire. He was latter appointed general of the Spanish army during the Dutch revolt and its ramifications, serving in Netherlands, France and the Holy Roman Empire until his death in 1592.

Farnese was regarded by contemporaries and historians as the greatest general of his age, as well as one of the best in history, for his talents as a commander, strategist and diplomat. He held a high leadership over the soldiers and mercenaries of varied nationalities which composed the Spanish tercios, including Spaniards, Italians, Germans and Walloons. His campaigns marked Spain's greatest successes in the Eighty Years' War, giving the Spanish crown permanent control of the southern provinces, in the process establishing the cultural and religious separation which would eventually become the nation of Belgium.

Our Lady of the Rosary (Latin: Beatae Mariae Virginis a Rosario), also known as Our Lady of the Holy Rosary, is a Marian title.

The Feast of Our Lady of the Rosary, formerly known as Feast of Our Lady of Victory and Feast of the Holy Rosary is celebrated on 7 October in the General Roman Calendar. 7 October is the anniversary of the decisive victory of the combined fleet of the Holy League of 1571 over the Ottoman navy at the Battle of Lepanto.