周書
These stories were sometimes pieced together to form a chronologically coherent narrative of early Ashina history. However, as the "Book of Zhou", the "Book of Sui", and the "Youyang Zazu" were all written around the same time, during the early Tang dynasty, it is debatable whether they could truly be considered chronological or rather should be considered competing versions of the Ashina's origin. The record of Turks in Zhoushu (written in the first half of the seventh century) describes the use of gold by Turks around the mid-fifth century: "(The Turks) inlaid gold sculpture of wolf head on their flag; their military men were called Fuli, that is, wolf in Chinese. It is because they are descendants of the wolf, and naming so is for not forgetting their ancestors."