《隋书·列传·卷二十七》
柳彧被汉王使者逼迫，加上起初并不知杨谅谋反，于是只得到晋阳城里去。
彧为使所逼，初不知谅反，将入城而谅反形已露。
Liu Yu was forced by King Han’s envoy, and in the beginning he didn’t know that Yang Liang was plotting a rebellion, so he just went to Jinyang.