Chang'an  listen  (simplified Chinese: 长安; traditional Chinese: 長安; pinyin: Cháng'ān; Wade–Giles: Ch'ang-an) is an ancient capital of more than ten dynasties in Chinese history, today known as Xi'an. Chang'an means "Perpetual Peace" in Classical Chinese. During the short-lived Xin dynasty, the city was renamed "Constant Peace" (Chinese: 常安; pinyin: Cháng'ān); yet after its fall in AD 23, the old name was restored.