Ferdinand Magellan was the famous explorer known for his expeditions in the Pacific Ocean. He is credited with leading the first expedition to successfully circumnavigate the globe between 1519 and 1522, demonstrating the vastness of the Earth and the interconnectedness of its oceans. Magellan's voyages expanded European knowledge of the Pacific and its islands. Although he did not survive the entire journey, his explorations laid the groundwork for future maritime exploration and trade routes.