Dictionary.net

A legendary country containing seven wonderful Indian cities, supposed by explorers of the sixteenth century to be located either in Florida or Northern Mexico. The legend originated from the story of the flight of a Portuguese archbishop, who during the conquest of Spain by the Arabs escaped to the Cape de Verde Islands, and founded seven cities. Numerous, and in nearly every instance fatal, expeditions were sent in search of these mythical cities. That of Panfilo de Narvaez, of 1527 to Florida was especially disastrous.