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From 247 to 221 BC he was Zheng, King of Qin (秦王政, Qín Wáng Zhèng, personal name 嬴政 Yíng Zhèng or 趙政 Zhào Zhèng). He became China's first emperor when he was 38 after the Qin had conquered all of the other Warring States and unified all of China in 221 BC.[2]