《宋史·列传·卷一百七十三》
按惯例，允许他把官职转给子孙，郑清之请求皇上追封给他的高祖郑洽，皇上同意了，这是特殊的恩惠。
故事，许回授子孙，清之请追封高祖洽，帝从之，盖异恩也。
Customarily, he would have been allowed to pass his position to his descendants, but Zheng Qingzhi requested that the emperor posthumously bestow the title on his great-grandfather Zheng Qia, and the emperor granted this request, which was exceptional favor.