merchant, traveler, theologian, and geographer whose treatise Topographia Christiana (c. 535–547; `Christian Topography`) contains one of the ... [1 related articles]
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http://www.britannica.com/eb/a-z/c/146
Cosmas was an Alexandrian merchant and traveller of the 6th century and afterwards a monk. He wrote several geographical and theological works, the most important of which extant is the Christian Topography. The author tried to prove that the earth is a parallelogram bounded by walls, which meet and form the vaulted roof which we call the sky.
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http://www.probertencyclopaedia.com/browse/CXCA.HTM
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