Du Mu wrote in his Epang Palace Rhapsody: 'Those who destroyed the six states were the six states themselves, not Qin.'
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history
The six were 齐, 楚, 燕, 韩, 赵 and 魏, the other great powers of the Warring States. 秦 conquered them between 230 and 221 BC, Han first and Qi last, and its king then took the title 始皇帝, First Emperor.