For example, when it is found that 'Roju' was written in an application form, it is necessary to conduct historical investigations to determine whether it indicated Karo under a lord or Roju at the bakufu.
例えば、願書類の宛先が「老中」とある場合、個別領主の家老なのか、幕府の老中を指すのか、史料批判が必要になる。