景行天皇
A group of kofuns at Nozu are considered to be the site of "Hinokimi" or the King of fire or possibly King of the Hi River. Hinokimi was considered to be a descendant of one who answered to Emperor Keikō. In the mythological period, Emperor Keikō in his journey for expanding the Yamato Ouken, saw unexplainable spots of moving fire, "Shiranui", (In Japanese, literally "unknown fire") in the Ariake Sea, and a Gozoku in that land replied that he did not know the fire. Today, it can be seen only on one day or so, and it is an optical phenomenon on the horizon of seeing moving spots of fire caused by fishing boats "through heated air layers". See also Shiranui (optical phenomenon).