"Azuma Kagami" was compiled in such times, looking back on the history of the Kamakura bakufu, on which the pillar (Yoriaishu) of the Sadatoki HOJO administration, especially the writers' family members depended, and also looking back on the establishment of the Hojo Tokuso family administration, especially the reign of Minamoto clan which lasted over three generations, those of Yasutoki and Tokiyori HOJO, and on the appearance and formation of the 'Family' system.
そうした時代に、『吾妻鏡』が編纂され、北条貞時政権の担い手（寄合衆）達、特に文筆の家の者が中心になって、自分達の寄って立つ鎌倉幕府、北条得宗家体制の成立、その中で源氏三代、そして北条泰時、北条時頼の時代を回顧され、そしてそれぞれの「家」の成立・形成を示しながら鎌倉幕府の歴史が振り返られていく。