The Portuguese navy defeats a joint fleet of the Ottoman Empire, the Republic of Venice, the Sultan of Gujarat, the Mamlûk Burji Sultanate of Egypt, the Zamorin of Calicut, and the Republic of Ragusa at the Battle of Diu in Diu, India.

The Portuguese Empire, c. 1415 to 1999, was the first and longest lasting of the European colonial empires. Initiated during the Age of Discovery, at one point territories included parts of the Americas and Africa, along with ports and trading posts throughout Asia and Oceania. At its greatest extent in 1820, the area under its control was approximately 5.5 million square kilometres, or 2.1 million square miles.