According to the same book, OTOMO no Koshibi who died on August 19, 777 (in old lunar calendar) was a son of OTOMO no Ojimaro and a grandson of Hitachi no kami Zo-Daikinchu Ofukei who had served the Asuka Dynasty.
また宝亀8年（777年）8月19日の大伴古慈斐の死亡記事は「飛鳥朝の常道頭、贈大錦中小吹負の孫」と書き、あわせて古慈斐が大伴祖父麻呂の子であることも記す。