After the Battle of Changge, Duke Zheng Zhuang gradually faded out of the sight of the princes. In his life, he did a lot of things that the princes didn't even dare to think about, and he faced the crimes, and he established a more brilliant career than the first monarch Huan Gong and Wu Gong. He didn't need to do anything to make a name for himself anymore - everything he did was a snake. Zheng Zhuanggong felt that his health was starting to deteriorate, so he spent the last days of his life enjoying life.

In the tenth year of the reign of Lu Huan (BC702), under the initiative of Prince Zheng Ku, the allied forces of Zheng, Qi and Wei broke out the Battle of Lang with the Lu State. The reason for this has already been said.

Zheng Guoren sent an envoy to Qi to ask for a teacher. Duke Qi was originally Lu Huangong's father-in-law, but he thought that Lu Huangong turned his elbow outward to help Ji Hou calculate himself. It turned out that Ji Hou adopted Lu Huan's strategy, and under the active mediation of Duke Huan, he finally succeeded in marrying the princess to King Zhou Huan; Ji Hou became the father-in-law of King Zhou Huan, and Qi Guo had no choice but to take Ji Guo in a short period of time. So Qi Xigong wanted to teach that restless son-in-law a lesson

However, Qi Xigong finally did not mean to completely turn his face with Lu Guo, he only sent a light army to help Zheng Ren in the battle. In order to take care of the face of Zheng Guoren and not to expand the war, Qi Xigong borrowed an army from Wei Guo. The princes all knew the relationship between Lu and Wei, and knew that the Wei army was here to behave.

Lu Huan Gong was extremely annoyed when Qi and Wei participated in the battle. But the gentleman said that this was exactly where the Marquis of Qi had good intentions, and if the Marquis of Qi borrowed troops from the Song State, then the war would have to be fought for at least three years.

The enemy and us fought in Langdi, on the outskirts of Qufu, but the scale of the battle was not large, and the scene was not fierce, and the Lu army lost some infantry and retreated to the city. The coalition forces circled around Langcheng with great force, and each returned home. Although the state of Lu was defeated, Lu Huangong still insisted that his approach was correct back then. But it doesn't matter what's right or wrong anymore.

At the beginning of the 11th year of the reign of Duke Lu Huan (BC701), Duke Zheng Zhuang, Duke Qi Xu, and Duke Wei Xuan held an alliance meeting in Evil Cao (southeast of present-day Yanjin). After the relationship between Zheng and Wei went through twists and turns, the monarchs of the two countries sat together again.

This was the last time that Zheng Zhuang attended the princes' meeting in his lifetime. The Duke of Qi also knew that Uncle Zheng had little time left, and in order to give the old friend of the people of Qi the highest treatment, he specially invited the princes and sons of the princes to attend this meeting. In this way, Zheng Zhuanggong brought his four favorite sons, Prince Hu, Gongzi Tu, Gongzi Qi and Gongzi Yi.

At the conference, Zheng Zhuanggong met with the prince of Qi Zhu'er, the "Asia-Pacific Son" Gongsun Wuzhi, Gongzi Jiu and Gongzi Xiaobai. Gongsun Wuzhi was the son of Yi Zhongnian, the half-brother of Duke Qi, who favored this nephew more than his own prince, so much so that he gave him the rank of prince; From this, Zheng Bo concluded that after the death of Duke Qi, there would be great chaos in the Qi Kingdom.

Zheng Zhuanggong also met Gongzi Jiao's teacher Bao Shuya, Gongzi Xiaobai's teachers Guan Yiwu and Zhaohu, and Guan Yiwu's conversation aroused his great interest; He predicted that Guan Yiwu would definitely become the pillar of the Qi State.

Zheng Zhuanggong also met with the prince of Weiguo, Gongzi Shou and Gongzi Shuo. He observed that the anxious son's face was gloomy and melancholy, and Gongzishou had been following him all the time, whispering to him from time to time, as if to persuade and comfort; And Gongzi Shuo is alive and well, looking like a villain; Zheng Zhuanggong also predicted that there would also be turmoil in the country.

The people of Qi saw that the third prince of Zheng Guo was more than afraid of the prince, and the prince would rather be alone than get together with his brothers, so they prophesied: "If Uncle Zheng dies, Zheng Guo will be in chaos." ”

All three monarchs who attended this assembly of princes died within two years, and there was great upheaval in each country.

The monarchs of the three kingdoms first performed a bloody ceremony, followed by a grand banquet. Just when everyone was drinking happily, the sound of noise and fighting suddenly came from the banquet, and people followed the sound to look over, but saw that Prince Qi Zhu'er and Zheng Gongzi were actually fighting.

It turns out that both of them are the kind of people who are unsightly, arrogant, and like to belittle others and elevate themselves. The two have the same opinion on the topic of belittling others, so they talk very speculatively; But when it came time to elevate himself, a disagreement arose, and a dispute ensued.

Of course, the prince of a big country is more well-informed than the prince of a small country. Childe's words gradually fell into disgrace, but he was stimulated by words and alcohol to his face turned red, and he exclaimed in a hurry: "I am indeed inferior to you, and I have never slept with my own sister!" ”

This sentence violated the taboo of the Qi court, and the prince Zhu'er was furious and grabbed a wine lord and slapped him on the head, instantly smashing the other party's head and bleeding. Gongzi didn't show weakness, picked up the eating utensils and splashed the other party's hot chicken soup, and jumped up and threw him to the ground. The two of them used their hands and feet together, and they hurled insults in their mouths, and they rolled into a ball.

Qi Hou and Zheng Bo immediately stopped this sudden and embarrassing brawl. Zheng Bo was so angry that he would have (if not for the persuasion of the Marquis of Qi and the Marquis of Wei) to kill his own son on the spot; And Qi Hou just scolded the prince a few words in a loud voice, and then ordered him to retreat. The two were immediately sent back to their respective countries, and after the farce was over, everyone continued to feast as if nothing had happened.

After Zheng Zhuanggong returned to China, he became ill, and on May 7, a generation of heroes Zheng Kou died suddenly.

Zheng Zhuang Gong ascended the throne at the age of fourteen and reigned for forty-three years. For the first twenty-two years of his reign, he lived in the shadow of his mother, Wu Jiang. It wasn't until he expelled Uncle Duan that he really grasped the power of the monarch. He was kind and generous to his subjects, and he repaid his enemies. He broke the shackles of Zhou Li and put Zheng Guo's interests first; Even the royal division who invaded Zheng Guo was mercilessly attacked; He pulled Zhou Tianzi down from the altar, disgraced the Zhou royal family, and ushered in a new era of Lile conquest from the princes.

Countries reacted differently to the death of Zheng Zhuanggong, and the most special one was King Zhou Huan. Although one of his brothers had just died, and he had ordered the whole city to mourn for three days, he was mad with joy when he got the news. He immediately announced that the mourning period would be postponed by one day, and a grand dinner was held on the same day. King Zhou Huan spent a sad night with a very happy mood.