The Qin Dynasty

Qin's philosophers had spent a century arguing for exactly this: Han Fei gave Legalism its sharpest theoretical edge, and Li Si put it into practice as the chancellor who helped Qin Shi Huang conquer the last independent kingdoms and declare himself the First Emperor — standardizing script, currency, and law across a unified China for the first time in history.

It was a triumph built on terror, and it did not last. Jing Ke's failed assassination attempt became legend precisely because it so nearly worked; the courtier Lü Buwei, who had engineered the young king's rise, was destroyed by the very throne he built. Within years of the emperor's death, the dynasty he meant to last ten thousand generations was already unraveling.