Mo Xi (Chinese: 妺喜; pinyin: Mò Xǐ; Wade–Giles: Mo4Hsi3)[1] was a concubine of Jie, the last ruler of the Chinese Xia dynasty. According to tradition, Mo Xi, Da Ji (concubine of the last ruler of the Shang dynasty) and Bao Si (concubine of the last ruler of the Western Zhou dynasty) are each blamed for the fall of these respective dynasties. According to the Spring and Autumn Annals of Wu and Yue, “Xia fell because of Mo Xi; Yin (Shang) fell because of Da Ji; Zhou fell because of Bao Si” (夏亡以妹喜,殷亡以妲己,周亡以褒姒).[2] Neither Mo Xi nor the Lake of Alcohol, with which she is associated, is mentioned in the story of Jie and the fall of Xia dynasty in the Records of the Grand Historian.