《梁书·列传·卷十三》
徐勉为其进言于高祖，请赐给他三公的仪仗，高祖不同意，仅在仪仗中加鼓吹而已。
勉为言于高祖，请三司之仪，弗许，但加鼓吹而已。
Xu Mian pleaded with Emperor Gaozu on his behalf, asking for the ceremonial guards of the Three Dukes, but Emperor Gaozu disagreed and only added drums and trumpets to the ceremonial guards.