The maritime countries of Portugal and England produced many seafaring explorers during the 16th and 17th centuries, many of whom sailed under the flags of other countries. Sailing for the Spanish, Ferdinand Magellan captained the ship that was the first to circle the world, charting many new maritime routes as it went. Henry Hudson, funded by the Dutch, sailed up what we call today the Hudson River, claiming the maritime area that now includes New York City for the Netherlands.