According to the historical narrative work "Ima Kagami" (The Mirror of the Present), Moroko caught Tadazane's eye from early on, made a request to her grandmother, MINAMOTO no Yoshiko, and Moroko shifted from the Retired Emperor.
『今鏡』によると、師子に一目惚れした忠実が祖母の源麗子（よしこ）に頼み、上皇から譲り受けたとする。