《旧五代史·后汉·高祖纪上》
四代祖讳名湍，当高祖拥有天下时，被追尊为明元皇帝，庙号叫文祖，陵墓叫懿陵；高祖母陇西李氏，追封以明贞皇后的谥号。
四代祖讳湍，帝有天下，追尊为明元皇帝，庙号文祖，陵曰懿陵；《五代会要》：湍为东汉显宗第八子淮阳王昞之后。
His grandfather's personal name was Juan, when Emperor Gaozu owned the country, he was honored as Emperor Mingyuan, temple name Wenzu, tomb called Yiling; grandmother from Longxi of the Li clan, honored with the posthumous title of Empress Mingzhen.