Yang Guang and Xiao Er were not bad, Yang Jian and Dugu Jialuo hurriedly ordered them to return to Beijing, which was indeed the idea of deposing the crown prince Yang Yong and re-establishing Yang Guang as the crown prince. And the initiator of this matter was not Yang Jian, the Sui ancestor who had been optimistic about Yang Guangtong since he led the three-way army to successfully destroy Nan Chen, but the queen Dugu Jialuo, who had been supporting the crown prince Yang Yong.

As early as the sixth year of the emperor's reign, the crown prince Yang Yong was investigated by Yang Jian for privately expanding the six rates of the East Palace, and was once under house arrest in Daxing Palace, Queen Dugu Jialuo in order to help the eldest son keep the position of the prince, painstakingly isolated Yang Yong from his many concubines in the East Palace, and ordered the crown princess Yuan to accompany Yang Yong to live in the Splendid Palace, hoping that the eldest son and his wife would live in the same palace, so that the Yuan family could conceive Yang Yong's child, and then help Yang Yong turn the crisis into safety, and gradually restore his status as a member of the court.

But who knew that the heavens did not fulfill people's wishes, although the Yuan family was once pregnant with Yang Yong's child, but unfortunately miscarried, and failed to save the unformed fetus in the womb. Fortunately, at that time, Yang Jian issued the edict of defeating Chen, and was about to raise troops to attack Chen, in order to maintain the balance and stability of the court, Yang Jian not only took the initiative to lift Yang Yong's house arrest, but also issued a marriage edict, and married Yang Yong's eldest daughter to Prime Minister Gao Ying's second son Gao Biaoren, which made the once dangerous Donggong storage position stable again.

In this process, the queen Dugu Jialuo can be said to have played a vital role, she not only stood firmly on Yang Yong's side when her eldest son was in trouble, and persuaded Yang Guang, Yang Jun and other brothers who were most likely to replace Yang Yong as the crown prince one by one to abide by the way of the monarch and ministers, and did not think wrongly, and repeatedly interceded for Yang Yong in front of her husband Yang Jian, clarified the misunderstanding between father and son, and single-handedly promoted the marriage of Gao Ying and Yang Yong, who enjoyed high prestige in the government and the opposition, and formed a family of children and daughters, and then stabilized Yang Yong's position as the prince.

Although, after Yang Guang's army destroyed Nanchen, Yang Jian handed over all the military power in the world to Yang Guang alone, which once caused all kinds of speculations about the government and the opposition about Yi Chu again, but because Yang Guang soon invited himself out of the town and stayed away from the power center of the imperial court, this turmoil quickly subsided.

However, just when the situation in Chang'an was developing in a stable direction, an unexpected thing happened, and this incident directly led to a 180-degree change in the attitude of Yang Yong's most powerful supporter, Empress Dugu Jialuo, from Yang Yong's staunch supporter to the first powerful figure to advocate Yi Chu.

At the end of the tenth year of the emperor's reign, the crown princess Yuan, who was ruled by Dugu Jialuo and married Yang Yong as his wife, suddenly died violently. And just three days before the violent death of the Yuan family, Dugu Jialuo also recruited the Yuan family in the Zhengyang Palace, and instructed her to do a lot of things like assisting the prince in managing the affairs of the East Palace and conceiving the prince's child as soon as possible. On that day, the Yuan family seemed to be in good spirits and showed no signs of infection, but three days later, he returned to the west and died inexplicably in the East Palace.

The violent death of the Yuan family made Dugu Jialuo first suspect the head of Yuan Zhaoxun, the most favored concubine by Yang Yong, and highly suspected that the Yun family poisoned the Yuan family in order to steal the position of the crown princess, and forced Yang Yong Yuan to drive the Yun family out of the East Palace on the day of his death and demote him to a commoner.

Yang Yong was naturally reluctant to demote the most favored Yun from the East Palace when the cause of Yuan's death had not yet been ascertained, so he tried his best to intercede for the Yun family in front of Dugu Jialuo, arguing that Yuan's death had nothing to do with Yun's family, and assured Dugu Jialuo that Yuan's death was purely an accident and was not caused by someone else's deliberate harm.

However, Dugu Jialuo, who has always been privately favored by men and neglected his wife, where can he listen to his son's explanation, the more Yang Yong returns to protect the Yun family, the more she suspects that the Yuan family died of the Yun family's assassination, and the mother and son made a big fuss in Daxing Palace for this matter, and finally Dugu Jialuo even shouted to Yang Yong with such words: "I will never let Ayunsheng's son sit on the throne one day, and want our Yang family to kowtow to him for generations. Don't blame your mother for being ruthless. ”

If Yang Yong had calmed down a little at that time and could recognize his situation, he would never ignore Dugu Jialuo's words to him, pat his buttocks, walk away, and return to the East Palace to personally handle the funeral of the Yuan family.

Dugu Jialuo saw that Yang Yong didn't even want the position of prince for a Yun family, so he was so angry that he fell seriously ill in Zhengyang Palace, and once his body recovered, he changed his previous attitude of full support for Yang Yong, and persuaded Yang Jian to urgently edict his second son Yang Guang to return to Chang'an, ostensibly saying that he was very concerned about his second daughter-in-law Xiao E because of the death of the Yuan family, and wanted to call her back to Beijing to live with him for a while, but Yang Jian and herself understood that this was a signal that he was about to depose his eldest son Yang Yong and set up his second son Yang Guang as the prince.

Yang Jian was deeply wary of the eldest son because of Yang Yong's private expansion of the East Palace, and later because of the second son Yang Guang's repeated meritorious services for the imperial court over the years, not only reversed the decline of the Central Plains Dynasty in the dispute with the Turks for decades, but also made the Turkic Khanate, which dominated the grasslands outside the Guanwai, bow down to the Great Sui and became a vassal of the Sui Dynasty, and under his auspices, he cracked the case of the "Wild Goose's Nest" in Nanchen, which had been unsolved for many years, and as the commander of the whole army of the Chen, the unified army destroyed the Nanchen and realized the great cause of the reunification of the north and the south. In Yang Jian's heart, he has begun to have the idea of changing from a leader to a sage. In addition, at this time, he was persuaded by the queen, so he pushed the boat down the river and sent Li Yuer to Guangling to urgently summon Yang Guang and his wife to return to Chang'an, firstly, to test the reaction of the ministers of the central court to the abolition of the crown prince, and secondly, to give Yang Yong a warning, warning him not to be too willful, and to ignore the prince's position for the sake of a woman. If Yang Yong could take this as a warning, take the initiative to find Dugu Jialuo to admit his mistake, and degrade the Yun family's mother and son out of the East Palace, according to Yang Jian's original intention, maybe he would not have issued an edict to abolish Yang Yong.

However, it was this edict sent to Guangling that caused a big uproar in the Chang'an Dynasty, which Yang Jian and his wife did not expect.

When Yang Guang and Xiao Er had not yet returned to the imperial capital Chang'an from Guangling, there were rumors in Chang'an City that the emperor was about to appoint a new crown prince.