As no historical document is available to prove whether a person called 'Kichiji' was a real-life figure, it is considered that he is not more than a legendary person and his details are unknown.
実際に「吉次」なる人物が実在したかどうかは、史料的に吉次の存在を裏付ける事が不可能であるため、彼の存在は伝説の域を出ず、まったく持って不明である。