This is an ancient resident register called “keichō” that has been reused as an ancient calendar called “guchūreki.” The resident register consisted of a “daichō” (statistical record) and a “name list” (rekimei), which listed the names of people and the characteristics of individual households. When creating the name list of the resident register, the text “Dewa District, Dewa Province, 28th day of the seventh month, Tenpyō 6 ” was written in small letters at the paper seams. It is thought that the back of the register was then used as an annotated calendar (guchūreki) after its storage time had expired. This is potent historical evidence, indicating that a provincial government existed in Akita Fort. The guchūreki was an ancient calendar that is divided into three levels (top, middle, bottom), with each day’s misfortunes, calamities, fortunes, and so forth indicated below the dates. This calendar is thought to be for Tenpyō-hōji 3 (759).