Duke Wu of Lu, personal name Ji Ao, was a duke of the

Lu state Lu (; 249 BC) was a vassal state during the Zhou dynasty of ancient China located around modern Shandong. Founded in the 11th century BC, its rulers were from a cadet branch of the House of Ji () that ruled the Zhou dynasty. The fi ...

. He succeeded his brother, Duke Shen. In spring of the ninth year of his reign, he paid a visit to

King Xuan of Zhou __NOTOC__ King Xuan of Zhou, personal name Ji Jing, was king of the Chinese Zhou dynasty; his reign has been reconstructed to be 827/25782 BC. He worked to restore royal authority after the Gonghe Regency. He fought the "Western Barbarians" ...

with his

heir apparent An heir apparent is a person who is first in the order of succession and cannot be displaced from inheriting by the birth of another person. A person who is first in the current order of succession but could be displaced by the birth of a more e ...

Kuo and younger son, Xi. King Xuan appreciated Xi greatly, and despite the objections of his councillor Zhongshan Fu (仲山甫), he decided to intervene and appoint Xi as the heir apparent over his elder brother. In summer, the three returned to Lu, and Duke Wu died shortly after.

Records of the Grand Historian The ''Shiji'', also known as ''Records of the Grand Historian'' or ''The Grand Scribe's Records'', is a Chinese historical text that is the first of the Twenty-Four Histories of imperial China. It was written during the late 2nd and early 1st ce ...

, Book 33,"欲立戲為魯太子。周之樊仲山父諫宣王曰：「廢長立少，不順；不順，必犯王命；犯王命，必誅之：故出令不可不順也。令之不行，政之不立；行而不順，民將棄上。夫下事上，少事長，所以為順。今天子建諸侯，立其少，是教民逆也。若魯從之，諸侯效之，王命將有所壅；若弗從而誅之，是自誅王命也。誅之亦失，不誅亦失，王其圖之。」宣王弗聽，卒立戲為魯太子。夏，武公歸而卒，戲立，是為懿公。魯懿公"

References

{{Dukes of Lu Monarchs of Lu (state) 9th-century BC Chinese monarchs 810s BC deaths