Ferdinand Magellan (c. 1480 – 27 April 1521) was a Portuguese explorer best known for having planned and led the 1519–22 Spanish expedition to the East Indies. During this expedition, he also discovered the Strait of Magellan, allowing his fleet to pass from the Atlantic into the Pacific Ocean and perform the first European navigation to Asia via the Pacific. Magellan was killed in battle in the Philippines and his crew, commanded by the Spanish Juan Sebastián Elcano, completed the return trip to Spain in 1522 achieving the first circumnavigation of Earth in history.

Born around 1480 into a family of minor Portuguese nobility, Magellan became a skilled sailor and naval officer in the service of the Portuguese Crown in Asia. King Manuel I refused to support Magellan's plan to reach the Moluccas, or Spice Islands, by sailing westwards around the American continent. Magellan then proposed the same plan to King Charles I of Spain, who approved it. In Seville, he married, fathered two children, and organized the expedition. In 1518, for his allegiance to the Hispanic monarchy, Magellan was appointed an admiral of the Spanish fleet and given command of the expedition—the five-ship "Armada of Molucca." He was also made a Commander of the Order of Santiago, one of the highest military ranks of the Spanish Empire.

Granted special powers and privileges by the king, he led the Armada from Sanlúcar de Barrameda southwest across the Atlantic Ocean, to the eastern coast of South America, and south to Patagonia. Despite a series of storms and mutinies, the expedition successfully passed through the Strait of Magellan into the Mar del Sur, which Magellan renamed the Mar Pacifico, or Pacific Ocean.