Who is the REAL Guan Yu? (revisited) 

This video will revisit the life of Guan Yu and focus solely on the historical account with information taken from the Records of the Three Kingdoms.
Sources
Chen, Shou (3rd century). Records of the Three Kingdoms (Sanguozhi)
de Crespigny, Rafe (2007). A Biographical Dictionary of Later Han to the Three Kingdoms 23-220 AD
Pei, Songzhi (5th century). Annotations to Records of the Three Kingdoms (Sanguozhi zhu)
Sima, Guang (1084). Zizhi Tongjian
(Author unknown) (4th century BC). Yi Zhou Shu
Brunnert, H.S.; Hagelstrom, V.V. (2013). Present Day Political Organization of China
Dubs, Homer H. (1938). "Chapter IV, Appendix I, Standard Weights and Measures of Han Times". The History of the Former Han Dynasty by Pan Ku. Volume 1.
Hulsewé, A.F.P. (1961). "Han measures". T'oung pao Archives. Vol. XLIX
Perkins, Dorothy (1999). Encyclopedia of China: The Essential Reference to China, Its History and Culture
Roberts, Moss (1991). Three Kingdoms: A Historical Novel.
ter Haar, Barend J. (2017). Guan Yu: the religious afterlife of a failed hero.
You, Zi'an (2010). 敷化宇內：清代以來關帝善書及其信仰的傳播 (PDF). Journal of Chinese Studies No. 50 (in Chinese)