A few years later, Duchess Wu, who had experienced a difficult birth, successfully gave birth to her second son, Uncle Duan. Since she had only two sons, her dislike for the eldest deepened her affection for the second. She went to the Yongwu again and asked him to divinate whether Gongshu Duan could ascend to the throne, and Yongwu said yes. After he finished speaking, he withdrew from Wu Jiang's room, and fled from Zheng Guo without even daring to return to his residence.

Wu Gong was not unaware of his wife's attitude towards his two sons, and he strengthened his protection of Kou Sheng to prevent Wu Jiang from secretly poisoning him. When Kou grew up to the age where he should be educated, Duke Wu sent him to the house of his younger brother Gongzi Lu.

The Emperor of the Zhou Dynasty implemented the "teacher protection system" for the education of the prince, that is, the education of the prince was the responsibility of the prince and the Taibao. When the prince was six or seven years old, he left the palace and went to live in the teacher's house. Children start with simple numerical calculations and words, and when they grow up, they learn etiquette, music, and dance. Towards youth, the main focus is on military skills. The princes did not have a teacher, but the education system was similar to that of the royal family.

Gongzi Lu is a model figure of the old aristocracy: he acts with a straight face, his face is always tense, and his waist is always straight. Perhaps influenced by his mother, the prince didn't like to laugh since he was a child; Now that he's living with an iron-faced uncle, he doesn't know what laughter is. Therefore, he always looks gloomy and full of worries. However, judging from what he did in the future, his expression was quite in line with his character traits.

Wu Gong knew that Wu Jiang would inevitably cause chaos after his death, so he began to formulate preventive measures. He removed some officials and appointed others. He sent Gongzi Duan to the home of a minister worthy of his trust to be educated, so as to temporarily cut off Wu Jiang's connection with Gongzi Duan, and promoted his confidant minister, Gongzi Lu He, to a high position enough to control national security.

Zheng Wugong died in the twenty-seventh year of his reign. During his serious illness, Wu Jiang tried his best to instigate him to depose Kou Sheng and replace Taishu Duan. Wu Gong was furious and said: "Your father killed my father back then, and now you want to use your son to kill my son?" If you dare to mention the abolition of the Emperor, I will send you back to Shenguo, and you will never want to come back! ”

After the death of Duke Wu, the crown prince Kou Sheng succeeded to the throne as Duke Zheng Zhuang. Duke Zheng Huan left his successor with the title of a burgeoning and vibrant state and dynasty secretary, and of course, a mother who wanted to put him to death as soon as possible, and a brother who was eyeing the throne.

Gong Zheng Zhuang soon reached the age of marriage, and he married a wife for him in Deng State. Deng Guo's surname is Man, and Man's surname is from his son's surname, and the founding monarch is the son of Shang King Wuding. One of Deng Man's sisters was married to Chu Zi Xiong Tong (King Wu of Chu). According to the rules of the Zhou rites, the two states of the same surname (Song and Dai) of Deng Guo were to send three concubines to Zheng Guo in marriage; In this way, Zheng Guo established marriage relations with three countries at the same time.

Later, Deng Man gave birth to the crown prince Hu (Zheng Huangong), and Song Guo married Yongshi and gave birth to Gongzi Tu (Zheng Ligong). There are many women favored by Zheng Zhuanggong, and there are even more favored sons; The status of the crown prince was not expensive, and the princes were incompatible with each other, which caused the division of Zheng Guo for more than ten years.

At that time, the monarch of the state of Lu was Lu Huigong. Lu Huigong reigned for forty-six years; He died in 723 BC, and the Eastern Zhou Dynasty entered the first year of the Spring and Autumn Period the following year.