However, if this principle was applied to ancient history, this would lead directly to doubt the history of Imperial Family, therefore, historical documents concerning the Imperial Family had not been criticized in earnest for a long time.
しかしこの原則を古代史に当てはめると、皇室の歴史を直接疑うことにつながる故に、長らく本格的な史料批判は行われないままであった。