In the process of unifying the ministries of Jurchen, Nurhachi initiated the Eight Banners system, with Nurhachi as the supreme commander. All the flag owners are sons and nephews of Nurhachi's cronies, and they must obey Nurhachi's unified command and dispatch, which is an important factor for Nurhachi to establish the post-Jin regime. However, the flag bearer is politically equal and economically independent, and everyone has great privileges. They all have their own officials and people, and their subordinates are mainly flag owners, which will inevitably form eight independent military and political groups within the post-Jin regime. These shortcomings of the Eight Banners system have left hidden dangers for the struggle of the owners of the Eight Banners in the future. For a long time, Nurhachi had a feeling about the succession of the post-Jin regime. Influenced by Han culture, he adopted Chu Ying, his eldest son, as his heir, and made Chu Ying take charge of military affairs to cultivate his political ability. However, Chu Ying was narrow-minded and very overbearing and intolerant in front of Minister Baylor. He forced his younger brothers to listen to him and not to tell his father Nurhachi Khan. He also threatened everywhere that all his younger brothers and ministers who had bad relations with him would be executed after he sweated. After these acts of Chu Ying were exposed, the investigation was true, and Nurhachi was very angry, and the idea of making Chu Anying his successor was completely shaken. However, Chu Ying did not take it as a warning. On the contrary, he intensified his hatred of Nurhachi, exposed him and Baylor's ministers, and colluded with private parties to carry out various conspiracy activities. He secretly cursed his father to heaven, wrote the names of Nurhachi and Baylor on paper, begged heaven and earth to show their spirits and let them die quickly, and then burned the paper to heaven. When Nurhachi knew about it, he imprisoned Chu Ying in a rage and executed him in August of the 43rd year of Wanli.

Shortly after Chu Ying's death, when Nurhachi established the post-Jin regime in the first year of Destiny, he specially appointed his second son Dai Shan, nephew A Min, abital Mang Courtais, and octoral Huang Taiji as the four Baylor. All state affairs were assisted by the four of them, especially the Baylor Dai Shan. As a military commander, although he was not good at governing government affairs, he was the best among the scholars, and there was no big mistake in assisting state affairs for many years. Therefore, at the beginning of the fifth year of the year of destiny. ("Manchu Old Files") The big brother mentioned here refers to Daishan, and the big Fujin is Abahai of Urnala.

However, shortly after Daishan's successor Khan was established, several unexpected things happened one after another.

In March of five years of destiny, Nuerhachi's concubine Dayinza (also known as Taicha or Taincha) went back to expose the ambiguous relationship between Daishan and her stepmother, doctor Jin. She said: Da Fujin (Abahai) and Da Baylor (Daishan) both ate and drank; With the four Baylor (that is, Huang Taiji), one or four Baylor suffered a lot but did not eat enough. On the other hand, Doctor Jin sent someone to visit Baylor's home two or three times, and Doctor Jin went out of the palace privately two or three times in the middle of the night. It seems that this trace is almost indecent, so we should check it. ("Man Wen Lao Dang") When Nurhachi was investigating this matter, another minister revealed that in the Khan Palace, Dafu was always decorated with gold, silver and oriental pearls, and his eyes were always on Baylor. (ditto) At that time, although Nurhachi hated Fei Da very much, he once wanted to put her to death, but he was afraid that his scandal would be made public and his face would be ugly. He was more afraid that Fei Da's children were left unattended, and he didn't want to quarrel with Daishan about it. Finally, he gave up Dafu Jin and gave it up in the name of Fei Da's private property. There is a problem that deserves attention. Why does an ordinary little princess Daiinza dare to expose her beloved big princess and the newly established Khan heir so boldly? Obviously, this powerful and ambitious prince is playing tricks behind his back. Huang Taiji clearly knows that among the sons of Nuerhachi, besides Dai Shan, there are also the fifth son Mongotai, the tenth son Dege, the twelfth son Azig, the fourteenth son Dourgen, the fifteenth son Duo Duo and the eighth son Huang Taiji himself. Among them, Mungurtai and Dege are rude and unpopular. Not long ago, their biological mother Fucha was sentenced to death for offending Nurhachi, which directly affected their political prestige and could not be regarded as the heir Khan. Aziz, Dourgen and Duoduo were all born by Nurhachi's favorite princess royal Urnala Abahai, especially Dourgen and Duoduo, who are deeply loved by Nurhachi, but they are still young (Dourgen is nine years old and Duoduo is seven years old), politically immature and have no prestige among scholars and ministers, no matter who they are. Therefore, Daishan is Huang Taiji's political opponent for the position of heir Khan. Only by defeating Daishan can he become the successor of Khan in the future.

Daishan has been in charge of politics for many years. In the Eight Banners, he and his son Yue Tuo each got a flag, which is very powerful. Besides, after Chu Ying's death, he lived for a long time, so it's really not easy to get him down. After much consideration, Huang Taiji thought that the best way was to alienate Nurhachi and Daishan. But to do such a thing, Huang Taiji should not come forward himself. It is best to let Nuerhachi's concubine come forward to expose it, giving people the feeling of jealousy and jealousy. In fact, it is to achieve the purpose of attacking big princess and endangering Daishan's reputation. The same is true of the development of things. After this incident, Daishan lost her prestige and completely lost the trust of Nurhachi. Of course, Huang Taiji's political status naturally improved.

Shortly after this matter was dealt with, another incident happened in September of the same year. Nurhachi investigated the escape attempts of Daishan's second son, Shuotuo, and A Min's younger brother, Qisangu, and found that Daishan listened to the rumors of his second wife and always abused his two adult sons, Yue Tuo and Shuotuo, and tried to kill Shuotuo himself, which made Shuotuo escape. At that time, Nurhachi said angrily to Daishan: You are also the son of your ex-wife. Why don't you think I'm closer to you? How can you be blinded by your wife's words and abuse your adult son? Besides, I have chosen you as a good minister to take charge. Why don't you give Yue Tuo and Schotto excellent retainers like me? You were bullied by your wife and gave the poor to your eldest son. Keep good people for yourself and let your wife's youngest son manage them! At the same time, Mang Courtais revealed that my brothers, scholars and domestic ministers are all afraid of brothers and sisters. After finding out the truth, Nurhachi rebuked Daishan and said, How can a man like you be qualified to be the king of a country? Daishan's status as the heir to Khan was immediately abolished and his people were taken away.

Desperate, Daishan killed his second wife on September 28th and went to Nurhachi to plead guilty. He swore to heaven: if I don't follow my father's lesson, listen to the advice of my three younger brothers and listen to my wife's advice by mistake, so that I lose the power entrusted to me by my father, then I am vicious. 1. If I am mean and make more mistakes, I should be killed. If I still have the heart to do wrong and do evil for good, and still hold resentment and hostility, I am willing to be punished by God, and there will be no good end. ("Emperor Taizong ascended the throne") Take an oath, write down an oath and burn the sky. Thus, Daishan gained Nurhachi's understanding to a great extent. Although he abolished the identity of Khan, he still retained Baylor's knighthood and the identity of the flag owner of Zhenghongqi Banner. Not only that, Nurhachi also decided not to establish an heir for the post-Jin Khan, but to use the system of eight masters and Baylor to jointly govern. Shortly thereafter, the ambiguous relationship between Fei Da and Daishan was basically clarified. Finally, because there was no big mistake, Fei Da was reset and Daishan's position was improved.

In March of the seventh year of Destiny, Nurhachi pointed out to Baylor, the eight great masters, on the issue of the successor of Khan: When inheriting his father's business as king, don't make a strong man the mainstay. If a powerful man is a king and relies on his strength as the mainstay, I am afraid that heaven is wrong. Can a person have some knowledge and be discussed by everyone? Your eight sons are eight kings. If the eight kings discuss it together, they will not fail. Choose those who don't reject your eight kings and succeed your father as king. If they don't listen to you and can't stop talking, your eight kings will replace your sweat and support the good people who don't refuse your words. ("Manchuria Old File") Here, Nurhachi clearly pointed out that the future monarch (Khan) should be jointly elected by Ba and Shuo Baylor. This method of choosing the Khan King created favorable conditions for Huang Taiji to obtain the Khan position at that time.

In the first month of the eleventh year of destiny, Nurhachi was defeated in the battle of Ningyuan and was seriously ill. In July of the same year, his condition deteriorated while recuperating in Qinghe Tangquan. On August 1 1, he died at the age of 68 in Laojibao, 40 miles from Shenyang. Before he died, he sent someone to call princess royal Ulanala. According to the records of the Qing Dynasty, Nurhachi left princess royal a will to die. The Japanese copy of A Record of the Three Dynasties records the scene at that time: first, the filial piety queen collapsed, and then Ulla, the daughter of Baylor, was named doctor Jin. Dafu Jinmeifeng is not pure and kind at heart, but often touches his heart. Clever as he is, he is made by a clever master. If he knew, he would be afraid of national chaos, and he would leave Bellevue a book in advance:' I will make him a martyr behind me. \' Zhu Baylor sued Dafu with an imperial edict, but Dafu didn't want to die, so he prevaricated. Jubelle insisted on doing this. Da Fujin took a dress and decorated it with jade, pearls and jewels. Because of his tears, he called Zhu Belleri:' I became emperor in advance in 12 years, and I was well fed and clothed in 26 years. How can I have the heart to leave? But my second youngest sons, Dourgen and Dodo, Da Fujin, died at the beginning of 19 1 1. He was seven when he was thirty, and he died with him. (Biography of Empresses and Concubines in Qing Dynasty) The martyrdom of Dafei is of great benefit to Huang Taiji's accession to the throne and his subsequent rule: First, after the five-year rectification of Dafei's destiny, he will continue to crack down on Daishan forces and clear all obstacles on the way to the throne; Second, in the past few years, Fei Da's three sons have all matured, and they are all masters of the Eight Banners. If Fei Da has any manipulation, the power will be great and the future trouble will be deep, which is really unbearable for Huang Taiji. Therefore, there was the matter of forcing big princess to be buried. At the same time, together with big princess, there are ordinary princess Daiinza and another ordinary princess Ajigen who knows the inside story.

After this contest, Huang Taiji's position was quite consolidated, and Khan had the highest voice. Finally, on the first day of September in the eleventh year of destiny, he succeeded to the throne and changed next year to the first year of Tiancong.