The ancients often said that the time of heaven, in fact, this "time of heaven" also contains a certain element of luck. Li Yuan's luck was quite good, for example, at that time, the great chaos in the world at the end of the Sui Dynasty was equivalent to giving Li Yuan a chance to raise troops, and the Sui Emperor gave up on himself, abandoned Chang'an and Luoyang, ran to Jiangdu, and created a miracle for Li Yuan to take Chang'an. After taking Chang'an, when the foothold of this emerging regime was unstable, Yu Wenhua and led 100,000 forbidden troops to return to Guanzhong, if Yu Wenhua and successfully brought these 100,000 elite soldiers to Guanzhong, it would definitely be a great threat to Li Yuan. However, this unit disappeared on the battlefield against the Wagang Army and Dou Jiande, so Li Yuan's fortunes were quite developed.
At that time, the situation in the world was very chaotic, and the forces of all sides were intertwined, Li Yuan had already established Yang You as the new emperor before the death of the Sui Emperor, and from the moment the Sui Emperor abandoned Chang'an and Luoyang to run to Jiangdu, he had already abandoned Jiangshan, and we can even say that the Sui Dynasty had already perished from that time. But in fact, no one dared to stand up and take the initiative to announce the end of the Sui Dynasty, no one was willing to be the head bird, no one would pick this leader, for Li Yuan at that time, he could not pick this leader, because from the moment he raised his army from Taiyuan, he had been announcing to the outside world, saying that he was the Kuangfu Emperor, he was against the Sui Emperor who had not been properly enthroned, and he wanted to support the Acting King Yang You.
At this time, there was still some time before he became emperor, and he had to find a transition period. Li Yuan officially held a grand ceremony and established the acting king Yang You as the new emperor, the era name was "Yining", and this acting king Yang You was later called The Sui Gong Emperor. Yang You was only a teenager at the time, and this child, he knew in his heart that he was a prisoner of Li Yuan's ranks, that is, a puppet, so as soon as he became emperor, he announced the appointment of Li Yuan as a chancellor, and the title was promoted from the Duke of Tang to the king of Tang, and he also ordered that the Wude Hall in the palace be given up to the chancellor as the chancellor' mansion. Moreover, the order under the city was originally called Jue, and this time, the rise was changed to be called harmony. Moreover, he also made a special decree that in addition to the ceremonies of sacrificing heaven and earth, all administrative affairs, whether political, economic, or cultural, were entrusted to the Minister.
In other words, Yang You willingly went to be a puppet. This is a wise and helpless choice for him. According to the record of the "Notes on the Entrepreneurship of the Tang Dynasty", after Li Yuan heard these orders, he was sincerely afraid, which was actually just a show, pretending that he was unwilling, and actually his heart blossomed.