Li Xiaogong
Li Yuan, who established Tang Dynasty at Chang'an in 618, sent his nephew Li Xiaogong the Prince of Zhao Commandery and Li Jing to attack Liang in 621. Li Xiaogong and Li Jing were successful in capturing Xiao Xi's capital Jiangling (江陵, in modern Jingzhou, Hubei) and forcing him to surrender. Thereafter, most of Liang territory submitted to Tang, and in spring 622, Qiu He sent Gao Shilian to Chang'an to show submission to Tang; Emperor Gaozu in turn sent Qiu He's sons Qiu Shili (丘師利) to Jiaozhi to accept his submission. Li Shimin, who was then the Prince of Qin and a major general under his father, retained Gao to serve on his staff as part of the government for the capital prefecture Yong Prefecture (雍州), of which he was prefect. As Gao was Princess Zhangsun's uncle, Li Shimin respected and trusted him.