Sima Yu had to ask Wang Tanzhi to redraw an edict and change it to read: "All major affairs of the family and the country are to be handled by Sima Huan, just as Zhuge Liang of the Shu Han Dynasty and Wang Dao of this dynasty were handled." On the day the edict was written, Sima Yu swallowed his breath.
Why didn't Huan Wen return to the Dynasty? Perhaps he was still a little jealous of Sima Yu, the Emperor of Jianwen. In that year, Huan Wen, Sima Xi and Sima Yu brothers rode in a chariot and traveled to Banqiao, southwest of Jiankang. Huan Wen suddenly issued an order to charge, and suddenly the war drums sounded in unison, the horn shook the sky, the chariot sped away, and the soldiers galloped. Huan Wen quietly observed the demeanor of the two princes: Sima Xi, who claimed to be quite a martial artist, was greatly frightened and asked to get off the bus; Sima Yu was "safe and fearless" ("Jin Shu JianWen Emperor Ji"), and Huan Wen was not impressed. However, at that time, people did not have a high opinion of Sima Yu's death: the Liu Song poet Xie Lingyun compared him to the last monarch of the Zhou Dynasty, Zhou Zhao (pronounced nǎn), Wang Jiyan and the Han Xiandi Emperor Liu Xie, but it was still reasonable; Xie An, a famous minister of the Eastern Jin Dynasty, actually said that he was similar to Emperor Hui of Jin, but he was good at talking better than Emperor Hui, which was too much: Sima Yu had rescued his own brother from the powerful Huan Wen after all. In addition, as early as 20 years ago, after Huan Wen destroyed the State of Chenghan, the imperial court was already quite jealous of him. At that time, Sima Yu, who was assisting the government in the dprk, saw that The Yangzhou Assassin Shi Yinhao also had a great reputation, and both the people in the court and the opposition admired and admired him, so he introduced Yin Hao as a confidant and let him participate in various affairs of the DPRK, hoping to use Yin Hao to counter Huan Wen. Unfortunately, Yin Hao did not argue with each other, led the Northern Expedition but did not fight effectively, was dismissed from his post after being attacked by Huan Wen, and finally died of depression. I would like to ask, did Sima Yu's efforts be done by Sima Zheng, the Emperor of Jinhui?

Huan Wen (312–373)
Emperor Jianwen had many concubines, and four of them bore him seven sons: when Sima Yu was still the King of Huiji, he married Jian Ji, the daughter of the Taiyuan clan Wang Clan, as a princess, and Wang Jian Ji gave birth to two sons for him: Sima Daosheng and Sima Yusheng; Hu Shuyi gave birth to Sima Yu and Sima Zhusheng; Wang Shuyi gave birth to Sima Tianliu; Lady Li was named Lingrong, and Sima Yao and Sima Daozi were born. Sima Yusheng, along with Sima Zhusheng and Sima Tianliu, all died prematurely at an early age; Sima Yao inherited his father's throne as Emperor Xiaowu. Let's start with his three other sons:
Sima Daosheng was both a concubine and the eldest son, and was naturally made the prince of Huiji, and later the official worshiped the riding attendant and gave the matter. Originally, Sima Daosheng should have had a good future, but unfortunately, this Shizi was "sexually irritable, did not cultivate the profession, and was more disrespectful" ("Jin Shu JianWen Three Sons Biography , Hui Si Si Shizi Sima Daosheng"), as for the specific bad deeds, the history books do not say. I don't know if it was the mother's protection of her son or some other reason, in short, both mother and son annoyed Sima Yu, and Sima Yu, in a rage, abolished both mother and son and imprisoned them. As a result, both mother and son died of depression. Sima Daosheng was only 24 years old at the time and had no descendants. Wang Jian ji was posthumously honored as "Empress Jian Wenshun" after Sima Yao ascended the throne. Because Emperor Jianwen reigned too shortly, he had not yet had time to make an empress before his death. According to the "Biography of the Later Concubines of the Book of Jin", "In the fourth year of Yonghe, the mother and son did not lose the emperor's will, and they were all deposed, and then they were worried. The "emperor" here is Sima Yu, the Jianwen Emperor, and the "hou" is Wang Jianji, yonghe four years for 348 AD, when Emperor Mu Sima Was only 6 years old, by the empress dowager Chu Garlic Zi Linchao regent, Sima Yu and other assistants. However, at that time, Sima Yu himself was only 29 years old, and the princess Wang Jianji, who was deposed and deposed, was certainly 20 years old, but what about their son Sima Daosheng? At most thirteen or fourteen years old, that is, he was imprisoned for at least 10 years until he died at the age of 24! Even if a minor of up to thirteen or fourteen years old is "sexually irritable, does not cultivate the profession, and is disrespectful", cannot be educated and disciplined? Is it necessary to imprison a member of the hall who will be the prince Shizi, the scattered riding attendant, and the matter —of course, the latter two can only be false titles—until death? What is the real reason for this? Today's people can probably only answer "I don't know".
Sima Yu was the second son of Emperor Jianwen, who had been brilliant since childhood, and it is said that when Sima Daosheng offended his father for "rudeness", Sima Yu repeatedly advised his eldest brother to "respect the way of prudence" ("Jinshu Jianwen Three Sons Biography : Linchuan Xianwang Sima Yu"). Where Sima Daosheng could hear it, Sima Yu burst into tears. Sima Yu was greatly surprised to see this, and from then on he greatly valued this son. Unfortunately, he died of illness when he was 17 years old, and Sima Yu's pain can be imagined, and he was posthumously honored as a "sacrifice to the son of the world". After Sima Yao ascended the throne, he posthumously honored this brother as "King Xian of Linchuan"; his late mother Hu Shuyi was also posthumously honored as "Princess Linchuan".
Sima Daozi was the youngest son of Emperor Jianwen and the half-brother of Emperor Xiaowu Sima Yao. Their mother, Li Lingrong, was born a "lowly" and originally had no chance to get close to Sima Yu, the prince. However, three of the five sons of the Huiji King died prematurely, the eldest son was deposed and imprisoned, and the wisest second son, Sima Yu, died of illness at the age of 17. Since then, Sima Yu has had many concubines, but no one has conceived for nearly 10 years. A prophecy tells him that you have two more "noble sons" in your destiny. At that time, a beautiful and virtuous Xu Gui, who was deeply loved by Sima Yu, gave birth to a daughter and was crowned princess of Xin'an, and Sima Yu pinned his hopes on her, but Xu Guiren never became pregnant again.
(The Emperor and His Descendants series No. 129)