《晋书·帝纪·第十章》
义熙五年，设置左右长史、司马、从事中郎共四名属官，加授羽葆和鼓吹。
义熙五年，置左右长史、司马、从事中郎四人，加羽葆鼓吹。
In the fifth year of the Yixi era, four subordinates were appointed, including left and right chief historians, a general, and a Gentleman of the Palace Attendants, and he was granted feathered ornaments and drums and music.