In 1012, wishing to make Seishi his empress, the emperor was still unable to make up his mind, worried about what Michinaga would think about his decision, whereupon Michinaga suggested that Seishi be officially invested as the Empress.
長和元年（1012年）、天皇は娍子を皇后に立てるよう欲するが、道長に憚って決しかねていたところ、道長から立后の提案があった。