From the time of Pythagoras of Samos (sixth century BC), the Greek philosopher-scientists taught that the Earth was a sphere and the harmonies of the universe were governed by mathematical relations. With the fall of the Roman Empire in the fifth century, cultural darkness descended on Europe and all intellectual pursuits languished under the rule of barbarians. In the Early Middle Ages, the universe reverted to a mythic polarization of Heaven and Earth. Cosmas (sixth century AD), an Alexandrian geographer, held that the Earth was a rectangular plane surrounded by an abyss of water. While European learning was at its lowest ebb, remnants of ancient knowledge survived in Byzantium, Syria, and Persia.
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