《宋史·列传·卷九十九》
前代大长公主使用臣妾之礼，本朝必先致献恭辞，仁宗以侄儿的身份事姑母之礼见献穆大长公主，这是事奉长辈之法。
前代大长公主用臣妾之礼；本朝必先致恭，仁宗以姪事姑之礼见献穆大长公主，此事长之法也。
In previous dynasties, grand princesses would use the etiquette of a concubine, our dynasty would definitely show respect first. Emperor Renzong would meet his maternal aunt, Grand Princess Xian Mu, as a nephew, this is the way to treat one's elders.