The 'Nantaiheiki' (Defects of the Taiheiki) is a historical work written by Sadayo IMAGAWA in which he attempts to correct the errors in the Taiheiki, though its primary focus is on the achievements of the Imagawa clan.
「難太平記」は今川貞世が著した史書で、太平記の誤りを訂正しつつ、今川氏の事績を中心に書かれている。