Ferdinand. Portuguese name Fern ãode Magalhães. ?1480–1521, Portuguese navigator in the service of Spain. He commanded an expedition of five ships that set out to sail to the East Indies via the West. He discovered the Strait of Magellan (1520), crossed the Pacific, and reached the Philippines (1521), where he was killed by natives. One of his ships reached Spain (1522) and was therefore the first to circumnavigate the world