《新五代史·世家·南汉世家第五》
贞明三年，刘龚即皇帝位，国号大越，改年号为干亨。
贞明三年，即皇帝位，国号大越，改元曰乾亨。
In the third year of Zhengming, Liu Gong took the position of emperor, the national title was Dayue, and the title of the year was changed to Gan Hsing.