Since the different name of the fifty-fourth Emperor, Emperor Ninmyo was Fukakusa tei, his posthumous name has the character go, when the name is read in Onyomi (Kanji character read in the Chinese way), it is called 'Gofukausa' which means someone undutiful to his parents, therefore it is said that only this Emperor's name is called 'Nochi no - Fukausa' in ('Go' read by Kun yomi) (Kazunaga Kyo Ki ("The Diary of Kazunaga Higashibojo").
第54代仁明天皇の別称が深草帝だったため、後の字が付くが、普通の天皇の加後号のように音読みすると「後深草（ごふかうさ）＝御不孝者」に通じるのを憚り、この天皇に限って、「後」の字を訓読みして「のちの―ふかうさ」院と称したという（『和長卿記』）。