The upheaval that
accompanied the migration of European peoples of late antiquity
shattered the power of the Roman Empire and consequently the entire
political order of Europe. Although Germanic kingdoms replaced Rome,
the culture of late antiquity, especially Christianity, continued to
have an effect and defined the early Middle Ages. Concurrent to the
developments in the Christian West, in Arabia the Prophet Muhammad
in the seventh century founded Islam, a new religion with immense
political and military effectiveness. Within a very short time,
great Islamic empires developed from the Iberian Peninsula and the
Maghreb to India and Central Asia, with centers such as Cordoba,
Cairo, Baghdad, and Samarkand.