Yang Shidao - During Emperor Taizong's Reign

During Emperor Taizong's Reign

In 636, after Emperor Gaozu had succeeded by his son Li Shimin in 626 (after Li Shimin ambushed and killed Li Jiancheng and another brother Li Yuanji and then effetively forced Emperor Gaozu to yield the throne to him), Yang Shidao was made Shizhong (侍中) -- the head of the examination bureau of government (門下省, Menxia Sheng) and a post considered one for a chancellor. He was considered careful in his actions, not leaking any words on the important matters of state. He once said, "When I was young, I read the Book of Han, and I saw that Kong Guang was not even willing to speak about the trees in the greenhouses inside the palace. I admired that, and I want to be like that." Whenever he left imperial gatherings, he would invite talented people to meet at his mansion to discuss literature, and the gatherings at his house were considered important literary events. He was also said to be talented at calligraphy. In 639, he became Zhongshu Ling (中書令), the head of the legislative bureau and also considered a post for a chancellor.

In 643, a plot centering the crown prince Li Chengqian was discovered where Li Chengqian considered overthrowing his father. Yang's stepson Zhao Jie (趙節), a son of Princess Guiyang (now titled Princess Changguang) by her deceased husband Zhao Cijing (趙慈景)) was one of the co-conspirators. When Yang was involved in the investigation of the case, he tried to intercede on Zhao Jie's behalf with Emperor Taizong, and this displeased Emperor Taizong. Yang was therefore demoted to the post of minister of civil service affairs, no longer a chancellor. Zhao Jie was executed. (Emperor Taizong later personally visited Princess Changguang to apologize for the fact that he could not spare Zhao Jie, but stated that he did so because he had to be fair in governing the state.) Because Yang was born out of a very honored lineage, he was well-acquainted with the nobles. However, because of this, he did not promote people that he knew well to avoid appearance of conflict of interest. This, in turn, however, brought criticism that he was not in fact being fair, as he was not promoting that he knew to be capable. In 644, when Emperor Taizong, at an imperial gathering, stated to his key officials their strengths and weaknesses, he spoke, with regard to Yang:

Yang Shidao is pure and mild in his actions, and he will not make mistakes or offenses. But because he is weak and timid in personality, I cannot receive his help in times of urgency.

In 645, when Emperor Taizong attacked Goguryeo, Yang followed him and was made acting Zhongshu Ling, but was said to perform poorly, and after the end of the campaign, he was demoted to the post of minister of labor, and then minister of rites. He died in 647 and was buried near the tomb of Emperor Taizong's wife Empress Zhangsun, where Emperor Taizong would eventually be buried himself.