 According to the "Records of the Grand Historian" by Han Dynasty historian Sima Qian, the practice was started by Duke Wu, the tenth ruler of Qin, who had 66 people buried with him in 678 BCE.The fourteenth ruler Duke Mu had 177 people buried with him in 621 BCE, including three senior government officials.Afterwards, the people of Qin wrote the famous poem "Yellow Bird" to condemn this barbaric practice, later compiled in the Confucian "Classic of Poetry".