Chang'an was an ancient capital of more than ten dynasties in Chinese history, today known as Xi'an. Chang'an means "Perpetual Peace" in Classical Chinese since it was a capital that was repeatedly used by new Chinese rulers. During the short-lived Xin dynasty, the city was renamed "Constant Peace" ; yet after its fall in AD 23, the old name was restored. By the time of the Ming dynasty, a new walled city named Xi'an, meaning "Western Peace", was built at the Sui and Tang Dynasty city's site, which has remained its name to the present day.