Xiao Yu, Duke Su of the State of Song (575-July 19, 648), was the younger brother of Queen Xiao. Xiao Yu was famous all over the world for his filial piety since he was a child. He was good at learning and writing, upright and upright, and was deeply proficient in Buddhist principles. He was reprimanded by Emperor Yang of the Sui Dynasty and was deeply trusted by Li Yuan during the Tang Dynasty. In June of the first year of Wude, he was awarded the order of internal history. Gaozu once said to Xiao Yu: "What you say is what the country relies on. "Xiao Yu was born into a dignitary and looked down on Du Ruhui, Fang Xuanling, Wen Yanbo, Wei Zheng and others, and often had disputes with them. Xiao Yu joked with Emperor Taizong of the Tang Dynasty during the banquet and said,"I am the son of the Liang Dynasty, the younger brother of the Empress of the Sui Dynasty, the minister Zuo Pushe, and the in-laws of the Emperor. "On June 24th, the 22nd year of Zhenguan, he died of illness and was ordered to be buried simply in a single coat. He was posthumously awarded the title of Sikong and Governor of Jingzhou. Emperor Taizong of the Tang Dynasty wrote a poem: "Strong grass is known by the wind, and sincere ministers are known by the upright. The brave man understands righteousness, and the wise will cherish benevolence."

Xiao Yu (575-July 19, 648), also known as Shiwen, had his ancestral home in Huanglian (now Qingliu County, Fujian Province). His grandfather was Emperor Xuan of the Later Liang Dynasty, and his great-grandfather was Prince Xiao Tong of Zhaoming. Xiao Xi, who competed with the Tang Dynasty for land, was still a relative of his sons and nephews. Empress Xiao of Emperor Yang of the Sui Dynasty was his biological sister. Xiao Yu was famous all over the world for his filial piety since he was a child. He was good at learning and writing, upright and upright, and was deeply proficient in Buddhist principles. As the queen's younger brother, Xiao Yu became an official at a young age in the Sui Dynasty and participated in important matters. Later, due to repeated remonstrances and disobeying orders, he was gradually reprimanded by Emperor Yang of the Sui Dynasty. In particular, Xiao Yu advised that Emperor Yang should abandon Gaoli and guard against Turks, which aroused Yang Guang's anger and demoted him to the county magistrate of Hechi. Emperor Gaozu of the Tang Dynasty valued Xiao Yu very much. As soon as he entered Beijing to settle his position, he sent a letter to invite him to be awarded the title of Doctor Guanglu, Duke of Song, and Minister of the Ministry of People's Affairs. The reason why Li Yuan cared so much about him was that Xiao Yu was upright; secondly, he had a golden branch and golden leaf for generations; and thirdly, he was the son-in-law of the Queen Du Gu family. Therefore, Li Yuan regarded him as a confidant. Every time he attended the court, he would give Xiao Yu a seat on the royal couch and affectionately call him "Xiao Lang." During the Tang Dynasty's revolution, Xiao Yu was most familiar with the national code and court etiquette. He also encouraged himself diligently and paid attention to political affairs, so he was deeply trusted by Li Yuan.

Emperor Taizong of the Tang Dynasty succeeded to the throne and worshipped him as Shangshu Zuo Pushe. At that time, Fang Xuanling and Du Ruhui's new courtiers were in the limelight, and Xiao Yu was deeply unhappy. When he wrote the letter, his resignation was sparse, and he was abandoned at home. Soon Taizong remembered his old feelings and restored his official title. Because of his bone temperament, he once argued with his minister in front of Taizong, and was dismissed for disrespect. After that, he rarely entered the core team of Taizong's political ruling.

Even so, Emperor Taizong often recalls the old story that he was afraid of disaster when he was the king of Qin, and Xiao Yu spoke good words for himself fairly and fairly in front of Li Yuan, saying, "This person can't be lured by generous benefits, and he can't be punished and afraid of him." He also gave a poem saying, "The wind knows the strong grass, and the board knows the sincere minister."

On the 24th day of Guiyou (July 19) in June of the 22nd year of Zhenguan, Xiao Yu died of illness at the age of seventy-four. The court often gave the posthumous title of "Su". Emperor Taizong thought that Xiao Yu's nature was too guessful, and he just avoided too much. Finally, he gave the posthumous title of "Zhen Yugong", which was given to Sikong and buried with him in the mausoleum (Tang Gaozu Mausoleum). From this, it can be seen that no matter how loyal a person is, after all, touching the dragon scales against it makes people feel bitter.

The 24 heroes of Lingyan Pavilion are in turn: 1. Duke of Zhao--Zhangsun Wuji;2. Prince of Hejian--Li Xiaogong;3. Duke of Lai--Du Ruhui;4. Duke of Zheng--Wei Zheng;5. Duke of Liang--Fang Xuanling;6. Duke of Shen--Gao Shilian 7, Duke of E---Yuchi Jingde;8. Duke of Wei--Li Jing;9. Duke of Song--Xiao Yu;10. Duke of Bao--Duan Zhixuan;11, Duke of Kuiguo--Liu Hongji;12, Duke of Jiang--Qu Tutong;13, Duke of Xunguo--Yin Qiao; 14. Duke Qiao Guoguo-Chai Shao;15. Duke Pi-Zhangsun Shunde;16. Duke Yun-Zhang Liang;17. Duke Lu-Hou Junji;18. Duke Tan-Zhang Gongjin;19. Duke Lu-Cheng Zhijie (Cheng Yaojin);20. Duke Yongxing-Yu Shinan;21. Duke Yu-Liu Zhenghui;22. Duke Ju-Tang Jian;23. Duke Britain-Li Ji (Xu Maogong);24. Duke Hu-Qin Shubao