 Cui Zhen's wife Han Farong was buried in a Datong located grave.To resist the threats poised by the Rourans, Northern Wei emperors started to embark on building its own Great Wall, the first since the Han dynasty.In 423, a defence line over 2,000 "li" () long was built ; its path roughly followed the old Zhao wall from Chicheng County in Hebei Province to Wuyuan County, Inner Mongolia.