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Around 170 AD, during Marcus Aurelius' reign, the Roman Empire was vast but had limited geographical knowledge. The empire included regions like Italy, Gaul, and parts of Britannia, but lacked accurate maps of distant lands like China and India. Claudius Ptolemy, a geographer in Alexandria, attempted to systematize geographical knowledge, creating a coordinate system for mapping, though his work contained many inaccuracies. Trade routes connected Rome to India, where spices and precious stones were sourced, while contact with China was rare. Dacia, a Roman province since 106 AD, was strategically important but not fully under Roman control. Ptolemy documented Dacia, noting its cities and geographical features, although his coordinates often do not match modern locations. The Roman Empire's influence was significant, yet it coexisted with unknown civilizations in the Americas.