Chang was a city state in ancient China founded in 806BC by Duke Huan of Chang. Duke Huan of Chang was named Ji You and all subsequent dukes took the name Ji. Sensing that the Western Zhou dynasty was in decline, Duke Huan moved his property, family members and merchants eastward. His successor, Duke Wu of Chang, annexed the states of Eastern Guo and Kuai and made Xin Zheng his capital. Duke Wu and his successor Duke Zhuang of Chang both served as advisors for kings of the Zhou Dynasty. The state of Chang was very strong at the beginning of the Spring and Autumn Period; it declined until it was annexed by the state of Han in 375BC.