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The captivating and definitive account of the most consequential natural disaster of modern times.On All Saints' Day 1755, tremors from an earthquake measuring perhaps 9.0 (or higher) on the moment magnitude scale swept furiously from their origin along the Atlantic seabed toward the Iberian and African coasts. Directly in their path was Lisbon, then one of the wealthiest cities in the world and the capital of a vast global empire. Within minutes, much of the city lay in ruins. But this was only the beginning. A half hour later, a giant tsunami unleashed by the quake smashed into Portugal's coastline and barreled up the Tagus River, carrying countless thousands out to sea. By day's end, the great wave chain would claim victims on four separate continents.