《魏书·列传·卷五十》
晋时，鸿胪郑默丧亲，坚决要求回家服丧，武帝被其孝诚所感动，于是制定律令立下丧服常制。
晋时，鸿胪郑默丧亲，固请终服，武帝感其孝诚，遂著令以为常。
In the Jin Dynasty, Zheng Mo, Honglu, lost his parents, and firmly requested to go home to mourn, Emperor Wu was moved by his filial piety, and therefore drafted the law and set up the regular system of mourning rites.