This is a household register that records names, ages, and age categories. The age categories “young boy,” “young girl,” and “man in good health” indicate whether the person is to be taxed or not. This demonstrates that Akita Fort carried out administrative tasks to survey and manage resident taxation. “Tsuno-no-omi” is a clan name from Kii Province or Suō Province, which suggests that people might have moved to Dewa Province from West Japan. Only the wife of the household head’s young brother had a different surname—“Hasetsukabe,” which shows that women in antiquity would also keep their names after marriage so a husband and wife could have different surnames. The age of other documents excavated there suggests that this was written in the first half of the ninth century.