Duke Cheng of Lu

Duke Cheng of Lu 鲁成公 was the son of Duke Xuan of Lu 鲁宣公 and the 21st ruler of the state of Lu during the Spring and Autumn period. He held office for 18 years, from 590 BCE to 573 BCE. His name was Heigong 黑肱 (his given name Heigong means "black arm").