褚遂良
In 617, when the agrarian rebel leader Xue Ju rose against Sui rule and declared himself the Emperor of Qin, Chu Liang and Chu Suiliang both joined Xue's administration. Chu Liang became a mid-level official, while Chu Suiliang became a low-level official. After Xue Ju's death in 618, his son and successor Xue Rengao was defeated by the Tang dynasty prince Li Shimin (the second son of Tang's founding emperor, Emperor Gaozu). Li Shimin spared Chu Liang and Chu Suiliang, and Chu Liang joined Li Shimin's staff, while Chu Suiliang remained at Qin Prefecture (秦州, roughly modern Tianshui, Gansu) to serve on the staff of the commandant at Qin Prefecture. His activities thereafter, until 636, were not recorded in history, although it was mentioned that he was well-studied in literature and history, and was a talented calligrapher, drawing praise from his father's friend Ouyang Xun, himself a famous calligrapher.