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De Administrando Imperio  

Constantine Porphyrogenitus

The Roman Empire in the West dissolved under the twin pressures of external invasion and internal decay, but the richer, more urban eastern half of the empire survived. Transformed by ... More


Marco Polo

By 1260 the Mongol Empire in the west stopped expanding; in the east the conquest of southern Song China in 1278 by Genghis Khan’s grandson Kubilai effectively ended Mongol expansion. Even ... More