褚遂良
By 636, when Li Shimin had been emperor for 10 years (as Emperor Taizong), Chu Suiliang was serving as a low-level official in the imperial archival bureau, when he was put in charge of recording Emperor Taizong's acts for historical records. In 640, after Emperor Taizong sent the general Hou Junji to conquer Gaochang, both Chu and Wei submitted petitions requesting that, rather than annexing Gaochang, Emperor Taizong should reestablish Gaochang as a vassal kingdom—advice that Emperor Taizong did not accept but would regret later. (This appeared to, however, begin a pattern where Chu would often offer honest advice to Emperor Taizong, which he often, but not always, accepted, but always respected, and Chu's role in this capacity began particularly more important after Wei's death in spring 643, as Wei had been instrumental in advising Emperor Taizong as to what he was doing properly and what he was doing improperly, for most of Emperor Taizong's reign.)