Bamboo Annals
Tang Dynasty (618-907 CE) scholar Kong Yingda noted that the "Bamboo Annals" contained the words "Han, Duke of Guo, enthroned Yuchen at Xie" inferring that Xie was a place name. A further scroll in the "Bamboo Annals" records that Xie was a place although its location unknown. However, according to Kong Yingda other parts of the "Bamboo Annals" contradict this suggestion.