《宋史·列传·卷一百九十四》
我朝景德二年，真宗居明德皇后丧，过了一个月就解除了丧服，明年遂祭献太庙，并合祭天地于圆丘。
国朝景德二年，真宗居明德皇后丧，既易月而除服，明年遂享太庙，合祀天地于圜丘。
During the Jingde reign of our dynasty, Emperor Zhenzong ended the mourning period for Empress Mingde after one month. The following year he sacrificed to the Imperial Ancestral Temple and worshipped Heaven and Earth at the Altar of Heaven.