《旧唐书·列传·卷八十三》
没多久，节度使马王与吐蕃在盐仓作战，战败，李晟率部下冲上去，将马王从乱军中救出，因功封合川郡王。
无何，节度使马璘与吐蕃战于盐仓，兵败，晟率所部横击之，拔璘出乱兵之中，以功封合川郡王。
Not long after that, the defence commissioner Ma Wang fought against the Tubo in Yancang and was defeated. Li Sheng rushed to his rescue and saved his life, so he was awarded the title of Duke of Hechaon County.