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Zheng Xuan (127–200 CE) was a preeminent Confucian classicist of the Eastern Han dynasty. His courtesy name was Kangcheng, and he was a native of Gaomi, Beihai Commandery (in present-day Gaomi, Shandong).
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When asked who the wisest man in Romance of the Three Kingdoms is, most would instantly answer Zhuge Liang. Yet there exists a figure—mentioned only briefly in the original text—who was not merely a scholar, but a mastermind whose influence shaped the course of history, despite never wielding a sword or commanding an army.