of the dukes of Lu was eventually undermined by the powerful feudal clans of Jisun 季孫, Mengsun 孟孫, and Shusun 叔孫 (called the Three Huan because they were descendants of Duke Huan of Lu). The domination of the Three Huan was such that Duke Zhao of Lu, in attempting to regain power, was exiled by them and never returned. It would not be until Duke Mu of Lu's reign, in the early Warring States period, that power eventually returned to the dukes again. In 249 BC King Kaolie of the state of Chu invaded and annexed Lu. Duke Qing, the last ruler of Lu, became a commoner. The main line of the Duke of Zhou's descendants came from his firstborn son, the State of Lu ruler Bo Qin's third son Yu (魚) whose descendants adopted the surname Dongye (東野). The Duke of Zhou's offspring held the title of Wujing Boshi (五经博士; 五經博士; Wǔjīng Bóshì). 東野家族大宗世系 Family Tree of the descendants of the Duke of Zhou in Chinese Duke Huan of Lu's son through Qingfu (慶父) was the ancestor of Mencius. The genealogy is found in the Mencius family tree (孟子世家大宗世系). Rulers List of Lu rulers based on the Records of the Grand Historian by Sima Qian: Rulers family tree See also Lu Commandery References External links </ref> Zhou dynasty 11th-century BC establishments in China States and territories established in the 11th century BC 3rd-century BC disestablishments 1st-millennium BC disestablishments in China Former monarchies