Zhangsun Wuji's biography in the Old Book of Tang actually wrote that the Zhangsuns traced their ancestry to the "third older brother of Emperor Xianwen of Northern Wei." See Old Book of Tang, vol. 65. However, this appeared to be in error, as Emperor Xianwen was the oldest son of his father, Emperor Wencheng of Northern Wei, and thus could not have had a third older brother. Based on the Book of Wei, the reference appeared to be intended to "the third older brother of Emperor Xian of Northern Wei," Emperor Xian being the posthumous honor conferred by Emperor Taiwu on Tuoba Kuali's son and successor Tuoba Linli (拓拔鄰立). See Book of Wei, vols. 1, 113.
