there is a theory that pointed out the similarity between ikima , a yamatai high ranking officer , and ' ikume ,' the name of emperor suinin , but details such as the names of envoys by himiko are not specified in the " record of ancient matters " and the " chronicles of japan ," the history books of yamato dynasty . 邪馬台国長官の伊支馬（いきま？）と垂仁天皇の名「いくめ」の近似性を指摘する説もあるが、大和朝廷の史書である記紀には、卑弥呼の遣使のこと等具体的に書かれていない。
when kayama asked perry to give him 4 days to talk with his superiors , perry answered that he would wait three days , and further threatened that if the shogunate did not dispatch a high ranking officer to whom he could hand the letter , he and his men would sail to the north of edo bay and hand the letter directly to the shogun . 香山は上司と相談する為に4日の猶予をくれるように頼んだが、ペリーは3日なら待とうと答え、さらに親書を受け取れるような高い身分の役人を派遣しなければ、江戸湾を北上して、兵を率いて上陸し、将軍に直接手渡しすると脅しをかけた。
in the documentary , " movement of history: the man that started the warring states period - soun hojo , challenge from the age of 56 " (nhk , guest: tetsuo owada , professor of shizuoka university ), broadcast in 2005 , soun is described as ' a late bloomer ' who became a high ranking officer in the bakufu government and who died at the age of 88 (a generally accepted theory that was adopted after reviewing various theories ). 2005年放送の「その時歴史が動いた：戦国をひらいた男～北条早雲 56才からの挑戦～」（日本放送協会、ゲスト：小和田哲男静岡大学教授）では、早雲を幕府の高級官僚としているが、年齢については享年88説を採り「大器晩成」として描いている（諸説を検討の結果一般的な説を採用したとのこと）。
