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During the Shang Dynasty, Boyi's descendant Zhongjue was in charge of Xichui (西垂, also called Quanqiu, in present-day Li County, Gansu) in the midst of the Rong tribes. Zhongjue's son Feilian (蜚廉) and grandson Elai served King Zhou of Shang, and Elai was killed when King Wu of Zhou overthrew Shang and founded the Zhou Dynasty. Feizi's father Daluo (大骆) was the great-great-grandson of Elai. However, Daluo's legal heir was not Feizi, but his other son , because Cheng was born to Daluo's main wife, daughter of the Marquess of the state of Shen.