Imago Mundi
A page from a 15th century book entitled Imago Mundi (Image of the World).
This book was written in 1410 by French scholar Pierre d'Ailly and published in 1480. From the annotations which appear in the margins of this page, it is known that Christopher Columbus read this copy before embarking on his 1492 voyage. Asserting that the Atlantic Ocean was relatively narrow, d'Ailly wrote that it 'was not so great that it can cover three quarters of the globe.' This shows that most people believed the earth to be a sphere. D'Ailly's book was one of the scholarly works which encouraged Columbus in his belief that the shortest route to Asia was to the west.

From Richard Humble and the editors of Time-Life Books, The Explorers (Alexandria, Virginia: Time-Life Books Inc., ©1979) 56. Courtesy of the Biblioteca Colombina, Institución Colombina, Seville, Spain.
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