《明史·志·卷二十七》
皇曾祖父谧号叫恒皇帝，庙号懿祖，皇曾祖母叫恒皇后。
皇曾祖考谥曰恒皇帝，庙号懿祖，皇曾祖妣曰恒皇后。
The temple name of the emperor's great-grandfather is Heng Emperor, and his temple name is Yizu. The emperor's great-grandmother is called Empress Heng.