Although the point mentioned above is based on indirect evidence, Kuniji YASHIRO, at the beginning of the Taisho period, collated "Azuma Kagami" with various historical materials to analyze the source materials more closely, finding out that it was based on the diaries of court nobles and many Kyo line materials.
前述の点は状況証拠の域を出ないが、大正時代初期の八代国治は、より直接的な史料批判、史料解剖として『吾妻鏡』と諸史料との突き合わせを行い、公卿の日記その他、京系の多く史料が原出典となっていることを見つける。