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'The Old Walls, Constantinople', (c4th century), 1890. Defensive stone walls surrounded and protected the city of Constantinople (today Istanbul in Turkey) as the new capital of the Roman Empire by Constantine the Great. 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)