 Yiqu hence transformed into a distinctly different branch from other Xirong tribes, though still retaining the tradition of levirate marriage.After the establishment of the Zhou Dynasty, Yiqu initially swore loyalty and participated in multiple Zhou campaigns against Di and other Rong tribes.In 771 BC, Marquess of Shen conspired with Quanrong (犬戎) to sack the Zhou capital city Haojing, killing King You of Zhou and his crown prince Bofu, and the Western Zhou Dynasty collapsed.