"O Lady of Last Assurance
(The Battle of Lepanto took place on 7 October 1571 when a galley fleet of the Holy League, a coalition of the Republic of Venice, the Papacy (under Pope Pius V), Spain (including Naples, Sicily and Sardinia), the Republic of Genoa, the Duchy of Savoy, the Knights Hospitaller and others, decisively defeated the main fleet of Ottoman war galleys.)
Although I've not read it, the book Empires of the Sea by Roger Crowley is reviewed as an readable, excellent historical take on the conflict. The conflict between Ottoman Turkey and Christian Spain for mastery of the Mediterranean basin had a huge influence on the development of the modern world, yet is probably not something you know very much about.
Our Lady of Lepanto, pray for us!