Empress Zhangsun
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.