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'Visconte Maggiolo' (1478 - 1530) was an Italian cartographer and sailor.
He was born in Florence and was a fellow sailor of explorer Giovanni da Verrazzano. He died of malaria in 1530.
In 1527, he created a map depicting the travels of Giovanni da Verrazano. This map had a major error, as Giovanni did not accurately describe the North American continent. This error was not to be fixed for over a century.