《晋书·志·第十四章》
咸宁三年，卫将军杨珧和中书监荀勖由于齐王司马攸有声望，担心惠帝以后会有祸难，所以重申已故司空裴秀要建立五等封建制的思想。不慌不忙地共同向武帝陈述时下应当做的事，认为 古时候设立侯，是为了保护王室。
咸宁三年，卫将军杨珧与中书监荀勖以齐王攸有时望，惧惠帝有后难，因追故司空裴秀立五等封建之旨，从容共陈时宜于武帝，以为 古者建侯，所以籓卫王室。
In the third year of the Xianning period, the general of the imperial guard Yang Yao and the minister of the central secretariat Xun Xu worried that there would be trouble after Emperor Hui because King Sima You of Qi was so prestigious. Therefore, they re-raised the idea of establishing a five-rank feudal system, which had been proposed by the late Sikong Pei Xiu. They took their time to present to Emperor Wu what ought to be done at this time, believing that “In ancient times, the rank of marquis was established to protect the royal house.”