Xi Shi (Hsi Shih; Chinese: 西施; pinyin: Xī Shī; Wade–Giles: Hsi1 Shih1, 506 BC – ?) was one of the renowned Four Beauties of ancient China. She was said to have lived during the end of Spring and Autumn period in Zhuji, the capital of the ancient State of Yue. Her name was Shi Yiguang (施夷光).
Xi Shi's beauty was said to be so extreme that while leaning over a balcony to look at the fish in the pond, the fish would be so dazzled that they forgot to swim and sank below the surface. This description serves as the first two characters of the Chinese idiom 沉魚落雁, 閉月羞花 (pinyin: chényú luòyàn, bìyuè xiūhuā), which is used to compliment someone's beauty.
King Goujian of Yue was once imprisoned by King Fuchai of Wu after a defeat in war, and Yue later became a tributary state to Wu. Secretly planning his revenge, Goujian's minister Wen Zhong suggested training beautiful women and offering them to Fuchai as a tribute (knowing Fuchai could not resist beautiful women). His other minister, Fan Li, found Xi Shi and Zheng Dan, and gave them to Fuchai in 490 BC.
Bewitched by the beauty and kindness of Xi Shi and Zheng Dan, Fuchai forgot all about his state affairs and at their instigation, killed his best advisor, the great general Wu Zixu. Fuchai even built Guanwa Palace (Palace of Beautiful Women) in an imperial park on the slope of Lingyan Hill, about 15 kilometres (9.3 mi) west of Suzhou. The strength of Wu dwindled, and in 473 BC Goujian launched his strike and completely routed the Wu army. King Fuchai lamented that he should have listened to Wu Zixu, and then committed suicide.