<P> Note: King Zhaoxiang of Qin (秦昭襄 王) had already been ruling Qin for 51 years when Qin annihilated the Zhou dynasty; however the other six warring states were still independent regimes . Some Chinese historiographers thus used the next year (the 52nd year of King Zhaoxiang of Qin) as the official succession from the Zhou dynasty . </P> <P> Qin Shi Huang was the first Chinese sovereign to proclaim himself "Emperor", after unifying China in 221 BC . That year is therefore generally taken by Western historians to be the start of the "Qin dynasty" which lasted for fifteen years until 207 when it was cut short by civil wars . </P> <Table> <Tr> <Th> Posthumous names / title </Th> <Th> Chinese family names and given names </Th> <Th> Period of Reigns </Th> </Tr> <Tr> <Td_colspan="4"> Convention: "Qin" + posthumous name </Td> </Tr> <Tr> <Td> Zhaoxiang (昭 襄 Zhāoxiāng) </Td> <Td> Ying Ze (嬴 則 yíng zé) or Ying Ji (嬴 稷 yíng jì) </Td> <Td> 306--250 BC </Td> </Tr> <Tr> <Td> Xiaowen (孝文 Xiàowén) </Td> <Td> Ying Zhu (嬴 柱 yíng zhù) </Td> <Td> 250 BC </Td> </Tr> <Tr> <Td> Zhuangxiang (莊 襄 Zhuāngxiāng) </Td> <Td> Ying Zichu (嬴 子 楚 yíng zǐ chǔ) </Td> <Td> 249--247 BC </Td> </Tr> <Tr> <Td_colspan="4"> Qin dynasty (221--207 BC) </Td> </Tr> <Tr> <Td> Shi Huangdi (始皇帝 Shǐ Huángdì) </Td> <Td> Ying Zheng (嬴 政 yíng zhèng) </Td> <Td> 246--210 BC </Td> </Tr> <Tr> <Td> Er Shi Huangdi (二 世 皇帝 Èr Shì Huángdì) </Td> <Td> Ying Huhai (嬴 胡亥 yíng hú hài) </Td> <Td> 210--207 BC </Td> </Tr> <Tr> <Td_colspan="4"> Ziying was often referred using personal name or <P> Ziying, King of Qin (秦 王子 嬰 qín wáng zi yīng) </P> </Td> </Tr> <Tr> <Td> Did not exist </Td> <Td> Ying Ziying (嬴 子 嬰 yíng zi yīng) </Td> <Td> 207 BC </Td> </Tr> </Table> <Tr> <Th> Posthumous names / title </Th> <Th> Chinese family names and given names </Th> <Th> Period of Reigns </Th> </Tr>

Who were the emperors of the qin dynasty