From Liu Yuxi's (
刘禹锡) Tang poem 《
乌衣巷》:
旧时王谢堂前燕,飞入寻常百姓家 - 'The swallows that once nested in the halls of Wang and Xie now fly into ordinary people's homes.' The Wang and Xie were the grandest aristocratic clans of the Jin dynasty; the poem meditates on how their glory has vanished.