As for the description in the geographical name of `紫香楽' (Shigaraki), there was no `紫香楽' (Shigaraki in kanji character) while there were three cases of `信楽宮' (Shigaraki in kanji character) in Shoso-in bunsho (the Record of Shoso-in), therefore, it might have been modified when Shoku Nihon gi (Continuation of Chronicles of Japan) was edited.
「紫香楽」の地名表記については、正倉院文書には「信楽宮」としたものが3件ある一方で、「紫香楽」と表記したものが全く無いため、続日本紀が編纂されたときの修辞の可能性が考えられる。