Kahan, also called Kahan no retsu (joint surety) means originally a chief retainer who had authority to sign or put seal at carrying out an order of a lord.
加判（かはん）とは、加判の列とも呼び、本来の意味は主君の上意を執行するにあたって、署名・押捺を行う職権を有する重臣をいう。