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Delisle, Guillaume(gēyōm` dəlēl`), 1675–1726, French geographer and cartographer. His most important work is a world map (1700), as accurate as the data available at that time permitted and the first map on which the errors of Ptolemy were wholly absent. Delisle is called the founder of modern cartography. He was geographer to Louis XV.
Born Feb. 28, 1675, in Paris; died there Jan. 25, 1726. French cartographer, member of the Paris Academy of Sciences (1702).
Delisle published a world atlas (1700-14) on the basis of new materials after critically revising the cartographic conceptions of his time; he was the first to improve the mapping of the Mediterranean Sea by eliminating an error in longitude that had remained on geographic maps since the time of Ptolemy (2nd century A.D.); he totally redid the map of Africa. Delisle made use of the achievements of Russian cartography in his works.