Editing Spring and Autumn period (section)

===Zheng falls out with the court (722–685)===
[[Duke Yin of Lu]] ascended the throne in 722.<ref name="Shi Ji, chapter 4">{{ cite book
| author1= Sima Qian | author1-link= Sima Qian
| author2= Sima Tan| author2-link= Sima Tan
 | script-title=zh:史記
| title= [[Records of the Grand Historian]]
| orig-year= 90s BCE
| year = 1959 | publisher= Zhonghua Shuju
| chapter=[[:zh:s:史記/卷004|4: 周本紀]]
| ref={{sfnref|Shiji}}
}}</ref> From this year on, the state of [[Lu (state)|Lu]] kept an official chronicle, the [[Spring and Autumn Annals]], which along with its commentaries is the standard source for the Spring and Autumn period. Corresponding chronicles are known to have existed in other states as well, but all but the Lu chronicle have been [[Qin Shi Huang's biblioclasm|lost]].

In 717, [[Duke Zhuang of Zheng]] went to the capital for an audience with [[King Huan of Zhou|King Huan]]. During the encounter the duke felt he was not treated with the respect and etiquette which would have been appropriate, given that Zheng was now the chief protector of the capital.<ref name="Shi Ji, chapter 4"/> In 715, Zheng also became involved in a border dispute with Lu regarding the Fields of Xu. The fields had been put in the care of Lu by the king for the exclusive purpose of producing royal sacrifices for the sacred [[Mount Tai]].<ref name="Shi Ji, chapter 4"/> For Zheng to regard the fields as just any other piece of land was an insult to the court.

By 707, relations had soured enough that the king launched a punitive expedition against Zheng. The duke counterattacked and raided Zhou territory, defeating the royal forces in the [[Battle of Xuge]] and injuring the king himself.<ref name="Hsu-p567" /><ref name="Shi Ji, chapter 4"/><ref>{{harvnb|Pines|2002|p=3}}</ref> Zheng was the first vassal to openly defy the king, kicking off the centuries of warfare without respect for the old traditions which would characterize the period.

The display of Zheng's martial strength was effective until succession problems after Zhuang's death in 701 weakened the state.<ref name="Higham-p412"/>

In 692, there was a failed assassination attempt against [[King Zhuang of Zhou|King Zhuang]], orchestrated by elements at court.<ref name="Shi Ji, chapter 4"/>