How does Religion saved by Spain elucidate its History?
In the Battle of Lepanto the troops of the Holy League defeated the Ottoman navy of Selim II (1524–1574). This Holy League was formed by an alliance of Spain, Venice and the Papal States.  The battle halted the expansion of the Ottoman Empire further in Europe.
The composition echoes a painting commenced by Titian for Alfonso d'Este, Duke of Ferrara (1486–1534), and left unfinished on the Duke's death; it was seen in Titian's studio in 1568 by Giorgio Vasari, still unfinished. It depicted a male nude bowing to Minerva and another woman with a laurel branch representing Peace, with Amphitrite in a chariot in the sea.  It was modified and sent to Holy Roman Emperor Maximilian II before November 1568, to show a figure representing the Holy Roman Empire defending an allegorical figure representing Religion.  It was engraved by Giulio Fontana c.1568, but the original oil painting is now lost.
Holy Roman Emperor Giorgio Vasari Holy Roman Empire Duke of Ferrara Ottoman navy Ottoman Empire Alfonso d'Este Selim II Battle of Lepanto Titian Holy League Papal States Venice Spain Maximilian II Giulio Fontana