《旧五代史·其它·僭伪列传二》
后唐同光三年，有白龙在南海出现，刘陟改伪乾亨元年为白龙元年，又改名为龚，以迎合白龙出现的祥瑞。
唐同光三年冬，白龙见于南海，改伪乾亨元年为白龙元年，陟又改名龚，以符龙之瑞也。
In the third year of Tongguang of Later Tang, a white dragon appeared in the South China Sea. Liu Zhi changed the first year of his reign from Weiganxing to Bailong and changed his name to Gong to coincide with the auspicious omen of the white dragon's appearance.