Duke Kao of Lu explained

Duke Kao of Lu (died 994 BC or 995 BC^[1]), personal name Ji Qiu, was the second duke of the Lu state, a dynastic vassal state of the Zhou dynasty. He was a son of Bo Qin (Duke Tai), the founding duke. Ruling for four years, he was succeeded by his younger brother, Duke Yang.^[2] His reign began in either 998 BC or 997 BC, the one-year discrepancy due to the Records of the Grand Historian giving Duke Wu's reign as ten years in one chapter and nine years in another.^[3]

Notes and References

1. Book: Nivison, David S.. The Key to the Chronology of the Three Dynasties: The "Modern Text" Bamboo Annals. David Shepherd Nivison. 1999. 25. Dept. of Asian and Middle Eastern Studies, University of Pennsylvania.
2. Book: Lei, Haizhong. Chinese Culture and the Chinese Military. 174. Cambridge University Press. 2020. 978-1-108-47918-9.
3. Book: Shaughnessy, Edward L.. Sources of Western Zhou History: Inscribed Bronze Vessels. Edward L. Shaughnessy. 221. University of California Press. 1991. 0-520-07028-3.