《旧唐书·本纪·卷十三》
冬十月十四，以虔王谅为横海军节度大使，以兵马使程怀信为留后。
冬十月丁丑，以虔王谅为横海军节度大使，以兵马使程怀信为留后。
On October 14, King Liang was appointed as the Director of the Henghai Military Circuit, and Cheng Huaixin who was the military governor was left behind.