One theory says that "Tokitsugu Kyoki," which was compiled in 1569 when Nobunaga conquered Mino Province, could show that Nohime (Kicho) was alive, because there is an entry in the diary that says that she was 'the lawful wife of Nobunaga' of the Saito family.
一説に、濃姫（帰蝶）の生存を示すのではないかと考えられる史料として、信長が美濃を制圧した時期である永禄12年（1569年）の『言継卿記』に斎藤家親族の「信長本妻」の記述がある。