《资治通鉴·汉纪·汉纪二十九》
武帝时衡山王刘赐、淮南王刘安图谋不轨，于是颁布左官律，制定附益法。封国国君只能得到供穿衣吃饭的租税，不参与政事。
武有衡山、淮南之谋，作左官之律，设附益之法；诸侯惟得衣食税租，不与政事。
In the reign of Emperor Wu, Liu Ci, King of Hengshan, and Liu An, King of Huainan, plotted against him. Hence the edict on Left Officials was issued and the Law of Accessories was formulated. The kings of the fiefdoms could only receive taxes sufficient for their food and clothing and had no part in political affairs.