《隋书·列传·卷二十七》
北周的规矩是，天子临朝，掌朝官员负责把笔墨纸砚拿到天子的宝座跟前，然后由承御大夫拿着给皇上。
周代故事，天子临轩，掌朝典笔砚，持至御坐，则承御大夫取以进之。
According to the rules of Northern Zhou, when the emperor holds court, the official in charge of the emperor's daily life is responsible for bringing the writing brush, ink, paper and inkstone to the emperor's throne, which will then be taken by the official in waiting and handed to the emperor.