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The authoritative historical source on Guan Yu's life is the "Records of the Three Kingdoms" ("Sanguozhi") written by Chen Shou in the third century. During the fifth century, Pei Songzhi annotated the "Sanguozhi" by incorporating information from other sources to Chen Shou's original work and adding his personal comments. Some alternative texts used in the annotations to Guan Yu's biography include: "Shu Ji" ("Records of Shu"), by Wang Yin; "Wei Shu" ("Book of Wei"), by Wang Chen, Xun Yi and Ruan Ji; "Jiang Biao Zhuan", by Yu Pu; "Fu Zi", by Fu Xuan; "Dianlue", by Yu Huan; "Wu Li" ("History of Wu"), by Hu Chong; and "Chronicles of Huayang", by Chang Qu.