Chapter 36 of the Shiji, compiled the Han dynasty historian Sima Qian, contains an entry for the hereditary house of Qi. It states that after conquering the Shang dynasty, King Wu of Zhou sought out a descendent of the legendary Yu the Great and enfeoffed him at Qi. There follows a list of rulers with the title gong (usually rendered 'duke'), but the first four implausibly span a period from the reign of King Wu (died c. 1043 BCE) to 677 BCE. Sima Qian states that Qi was destroyed in 445 BCE by King Hui of Chu, and concludes that it was "small and unimportant, its affairs were not worthy of extolling and narrating".[2]
The state of Qi is perhaps best known from the popular Chinese idiomQǐ rén yōu tiān (杞人忧天/杞人憂天, literally 'Qi person worried about the sky') based on a story in the Liezi, in which a man of Qi often talked anxiously about the sky falling down. The idiom is used when mocking someone's groundless fears.[4]
Since Qi claimed descent from the royal house of the Xia dynasty, Confucius went there to learn about the ancient rituals of the Xia, but was disappointed: "I could discuss the rites of the Xia, but Qi does not sufficiently attest them."[a]<ref>{{cite book
^Nienhauser, William H. Jr., ed. (2006). The Grand Scribe's Records, Volume V.1: The Hereditary Houses of Pre-Han China, Part I. Indiana University Press. pp. 232–234. ISBN0-253-34025-X.
^Jiao, Liwei; Kubler, Cornelius C.; Zhang, Weiguo (2011). 500 Common Chinese Idioms: An annotated frequency dictionary. Rourledge. pp. 77–78. ISBN978-0-415-59893-4.