There was a description of the Emperor in 'The Murasaki Shikibu Diary' that, when he was born, Michinaga had long waited to have a prince from the maternal side, so that he became the first glory of the Imperial Family.
その誕生の様子は「紫式部日記」に詳しく、道長にとって待望久しい外孫皇子出生はその後の一族の栄華の初花となる。