According to "Zoku Shigusho" (Historical work published in 1791), the decision to change the name of the era to 'Ryakuo' in the Imperial Court on October 19, 1338 was not conveyed to the bakufu, and it was not until October 25 that the seniors in the bakufu, including Takauji ASHIKAGA knew of the change.
『続史愚抄』によれば、建武5年8月28日(旧暦)に朝廷で行われた「暦応」改元の決定は幕府側には伝えられず、足利尊氏ら幕府首脳は9月4日(旧暦)になって初めて知ったという。