《新五代史·世家·南唐世家第二》
三年四月，李昪在郊外圆丘祭祀昊天上帝，祭礼结束，群臣请求进献尊号。
三年四月，昪郊祀昊天上帝于圆丘，礼毕，群臣请上尊号。
In the fourth month of the third year, Li Bian sacrificed to Haotian God at the circular mound outside the capital. After the sacrificial rites, the ministers requested to offer a尊号 (imperial title).