Amerigo Vespucci explored the world for Spain and Portugal during the late 15th century and early 16th century. The precise amount of his exploration is controversial. Some researchers believe that letters supposedly written by Vespucci that describe his journeys are forgeries.
Some of the letters discuss four ocean trips, while others mention just two. Vespucci's first verified journey began in 1499. He was the navigator for a fleet of four Spanish ships. This expedition explored some of South America and included the discovery of the Amazon River. It also ventured into the West Indies. The second confirmed trip occurred in 1501, when Vespucci sailed for Portugal and traveled as least as far as Brazil.