From Liu Yuxi's 《
乌衣巷》 (Tang dynasty):
朱雀桥边野草花,
乌衣巷口夕阳斜。
旧时王谢堂前燕,
飞入寻常百姓家。 'Wang' and 'Xie' are the Wang Dao and Xie An clans — the dominant aristocratic families of the Eastern Jin dynasty, whose mansions stood on Wuyi Lane in Jiankang (modern Nanjing). By Liu Yuxi's day, their glory was long gone — only the swallows remained, now nesting among commoners.