Portugese explorer who (after a disagreement with the king of Portugal) convinced the King of Spain to finance the first voyage all the way around the world in 1519. The ships went across the Atlantic Ocean, explored the southeast coast of South America, and discovered the Strait of Magellan. Then they crossed the Pacific Ocean, where in April 1521 he was killed in the Philippines. The crew of the ship completed the voyage back to Europe without him.