《晋书·帝纪·第二章》
往昔的伊尹，是有莘氏的家奴，一旦佐助了成汤，就有了阿衡的称号。
昔伊尹，有莘氏之媵臣耳，一佐成汤，遂荷阿衡之号。
In the past, Yi Yin was a household slave of Youxin clan, but once assisted Cheng Tang to establish the Shang dynasty, and then was titled as Aheng.