Since he was in need for a huge amount of gold for building Todai-ji Temple, Emperor Shomu became frenzied with joy about this gold, so he changed the era from Tenpyo into Tenpyo Kanpo, and on May 11 in the same year, Matanari, the former Mutsu no Kuni no Suke, was promoted to Shogoinojo (Senior Fifth Rank, Upper Grade).
東大寺の造営に多量の金を必要としていた聖武天皇はこれに狂喜し元号を天平から天平感宝に改め、同年5月11日、元陸奥国介であった全成も正五位上に昇進した。