In Japan, there used to be an era called "Jogan" (Japan) during the reign of Emperor Seiwa in early Heian period, and a reign called "Jogan no chi" (Glorious Jogan rule" was present.
日本でも平安時代初期、清和天皇の代に貞観(日本)という元号があり、「貞観の治」と呼ばれる治世が存在した。