《资治通鉴·唐纪·唐纪二十五》
相王李旦的五个被封为王的儿子都把宅第并排建在隆庆池以北，善于望气的人说： 这里常常有盛大的帝王之气，近来这种帝王之气尤为强劲。 
相王子五王列第于其北，望气者言： 常郁郁有帝王气，比日尤甚。 
King Li Dan of Xiang's five sons were all granted peerage as kings and had their mansions built side by side north of Longqing Pond; a person good at physiognomy said: " There is often the aura of a great sovereign here, and recently this aura has become especially strong."