However, according to the records of "Azuma Kagami," when Yoshinaka died, Yoshihide was already nine years old and it is impossible for Tomoe to be Yoshihide's mother considering their ages; so it is thought to be a fiction in the book.
しかし『吾妻鏡』の記録によると義仲滅亡時に義秀はすでに9歳になっており、巴が義秀の母というのは年齢的にありえず、物語上の創作と見られる。