《隋书·列传·卷十》
开皇十八年，发起辽东战争，以杨谅为行军元帅，率部到辽水，遇上疾病，不利而还。
十八年，起辽东之役，以谅为行军元帅，率众至辽水，遇疾疫，不利而还。
In the 18th year of "Kaihuang Period", a war against Liaodong was launched, with Yang Liang as the general of the expeditionary force, who led his troops to Liaoshui, where he fell ill and returned without any achievement.