In fall 556, while Yuwen Tai was on a tour of the northern provinces, he became ill at Qiantun Mountain (牽屯山, in modern Guyuan, Ningxia). He summoned his nephew Yuwen Hu to Qiantun and entrusted the affairs of the state as well as his sons to Yuwen Hu. He soon died, and Yuwen Tai's 14-year-old son Yuwen Jue took over his titles, while Yuwen Hu took the reins of the state. Emperor Gong was subsequently forced to create Yuwen Jue the greater title of Duke of Zhou.