Italian explorers and navigators from the dominant maritime republics, eager to find an alternative route to the Indies in order to bypass the Ottoman Empire, offered their services to monarchs of Atlantic countries and played a key role in ushering the Age of Discovery and the European colonization of the Americas. The most notable among them were: Christopher Columbus, colonizer in the name of Spain, who is credited with discovering the New World and the opening of the Americas for conquest and settlement by Europeans; John Cabot, sailing for England, who was the first European to set foot in "New Found Land" and explore parts of the North American continent in 1497; Amerigo Vespucci, sailing for Portugal, who first demonstrated in about 1501 that the New World (in particular Brazil) was not Asia as initially conjectured, but a fourth continent previously unknown to people of the Old World (America is named after him); and Giovanni da Verrazzano, at the service of France, renowned as the first European to explore the Atlantic coast of North America between Florida and New Brunswick in 1524.