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In page Human sacrifice:

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The sacrifice of a high-ranking male's slaves, concubines, or servants upon his death (called Xun Zang 殉葬 or Sheng Xun 生殉) was a more common form. The stated purpose was to provide companionship for the dead in the afterlife. In earlier times, the victims were either killed or buried alive, while later they were usually forced to commit suicide.[citation needed]