After Yoritomo defeated the Oshu-Fujiwara clan and conquered Oshu (Mutsu province), he donated part of Shida-gun as an offering to Hachiman-gu Shrine and triumphantly returned to Kamakura.
頼朝は、奥州藤原氏を破って奥州を平定した後、志田郡の一部を八幡宮の神料として寄進、鎌倉に凱旋した。