By the way, although a view held by a small minority it is said that the author of "Okagami" (The Great Mirror), that described the history of Michinaga and his family with a sharp point of view, was Yoshinobu.
ちなみに、少数説であるが、道長とその一族の歴史を鋭い視点で描いた「大鏡」の作者を能信とする説もある。