《旧五代史·后唐·列传六》
王镕派使者向庄宗告急，庄宗命周德威率兵接应，王镕重新奉唐朝正朔，称天七年。
镕遣使告急庄宗，庄宗命周德威率兵应之；镕复奉唐朝正朔，称天祐七年。
Wang Rong sent an envoy to Zhuangzong for help, and Zhuangzong sent Zhou Dewei to take over Wang Rong's command, who obeyed the Tang dynasty's calendar again and called it the seventh year of Tian.