With the cutting-off of the supplies of papyrus by the Mohammedans, the Mediterranean, long a Roman lake, became a Muslim lake, and the Roman center collapsed. What had been the margins of this center-margin structure became independent centers on a new feudal, structural base. The Roman center collapsed by the fifth century a.d. as wheel, road, and paper dwindled into a ghostly paradigm of former power. Papyrus never returned. Byzantium, like the medieval centers, relied heavily on parchment, but this was too expensive and scarce a material to speed commerce or even education. It was paper
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