Ли Сы
In 237 BC a clique at the Qin court urged King Zheng to expel all foreigners from the state to prevent espionage. As a native of Chu, Li Si would be a target of the policy so he memorialised the king explaining the many benefits of foreigners to Qin including "the sultry girls of Zhao." The king relented and, impressed with Li Si's rhetoric, promoted him. The same year, Li Si is reported to have urged King Zheng to annex the neighbouring State of Han to order to intimidate the other five remaining states. Li Si also wrote the "Petition against the Expulsion of Guest Officers" (Jianzhuke Shu) in 234 BC. Han Fei, a member of the aristocracy from the State of Han, was asked by the Han king to go to Qin and resolve the situation through diplomacy. Li Si, who envied Han Fei's intellect, persuaded the Qin king that he could neither send Han Fei back (as his superior ability would be a threat to Qin) nor employ him (as his loyalty would not be to Qin). As a result, Han Fei was imprisoned, and in 233 BC convinced by Li Si to commit suicide by taking poison. The State of Han was later conquered in 230 BC.