When Shigehira, who was a younger brother of Munemori, was captured in Ichinotani valley, requested by Goshirakawa, he sent a letter asking for the return of Emperor Antoku and the three sacred imperial treasures.
一ノ谷で捕虜となった弟の重衡が後白河の意向を受けて安徳天皇と三種の神器の帰還を求める書状を送るった。