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'Baghdad', 1890. Baghdad, the capital of Iraq, largest city of the Middle Ages with a population of more than a million. Instructed by Al-Mansur ((754-775 AD), it took four years to build (764-768). From "Cassell's Illustrated Universal History, Vol. III - The Middle Ages", by Edmund Ollier. [Cassell and Company, Limited, London, Paris and Melbourne, 1890. ] (KEYSTONE/HERITAGE IMAGES/The Print Collector)