For 10 points, name this Legalist who unified China as the first emperor of the Qin Dynasty.
After betraying this ruler, general Fan Wuji committed suicide so that his severed head could be used in an assassination attempt. This ruler forced one rival to execute his own son, Crown Prince Dan. One attempt to overthrow this ruler involved the fake eunuch Lao Ai, who revealed himself when he drunkenly boasted of being this ruler's stepfather, and was orchestrated by the chancellor Lu Buwei. This ruler sided with the young Li Xin against the older Wang Jian during a dispute about the size of the military, endorsing a smaller 200,000 man army that was embarrassingly defeated. Attempted assassins of this ruler included Gao Jianli, a blind lute player, and Jing Ke, who threw a dagger and missed. This man consolidated his power by defeating the State of Chu, and was assisted by the chancellor Li Si, who promoted burying scholars and burning books. For 10 points, name this Legalist who unified China as the first emperor of the Qin Dynasty. 
After betraying this ruler, general Fan Wuji committed suicide so that his severed head could be used in an assassination attempt.
Shi Huang Di [or Qin Shi Huang; or Zhao Zheng]