The phrase wansui (; literally ten thousand years) was once used casually to wish a person long life. The term's use was probably coined during Han dynasty. In 110 BC, Emperor Wu of Han was addressed by the phrase Wansui on Mount Song. According to legend, Mount Song itself called out the phrase to address the emperor. During the Tang dynasty, it came to be used exclusively to address the emperor as a prayer for his long life and reign. Then, during the Five Dynasties and Ten Kingdoms period, its use was temporarily extended to include certain higher-ranking members of the imperial court, but this tradition was relatively short-lived: in later imperial history, using it to address someone other than the emperor was considered an act of sedition and was consequently highly dangerous. During certain reigns of weak emperors, powerful eunuchs such as Liu Jin and Wei Zhongxian circumvented this restriction by styling themselves with jiǔ qiān suì (, literally 9,000 years) so as to display their high positions, which were close to or even exceeded the emperor's, while still remaining reverent to the title of the emperor.