Xici or Xi Ci (Great Commentary, simplified Chinese: 系辞; traditional Chinese: 繫辭; pinyin: Xì Cí) is one of the Ten Wings, a collection of Confucian books traditionally included in the I Ching written during the fifth century BC. Its origins are unknown, but it is suspected of being the product of scholars who did not believe prevailing Daoist thought.[citation needed] A silk manuscript version of it dating from 168 BCE was found at the Mawangdui site in Changsha in 1973.[1] It's one of the most important sources about early Chinese cosmology.[1] Among the mythologies stressed in the book is that of Fuxi, the emperor-god.[citation needed]