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Ortelius, also occasionally spelled Orthellius, is renowned as the creator of the first modern atlas, titled "Theatrum Orbis Terrarum," published in 1570. This groundbreaking work revolutionized cartography by presenting a comprehensive collection of maps accompanied by detailed information and historical context. Ortelius's atlas became a standard reference for geographers, explorers, and scholars, shaping the understanding of the world during his time and beyond.