天乙
Yi Yin (, born Yī Zhì (伊挚), also known as A Heng (阿衡)), was a Chinese politician who was a minister of the early Shang dynasty, and one of the honoured officials of the era. He helped Tang of Shang, the founder of the Shang dynasty, to defeat King Jie of Xia. Oracle inscriptions of Yi have been found, evidence that his social status was high.