Located in Tsuchitocho, Sakai City, Osaka Prefecture, Ono-ji Temple is a Shingon Buddhist temple and one of the 49 temples established by the Nara period monk Gyoki. The remains of a pagoda remain to the southeast of the temple complex. Shaped like a truncated square pyramid measuring 53.1 meters on each side and over 8.6 meters high, the pagoda is believed to have originally been a tiled earthen tower with a 13-tiered pyramid-like shape, based on the numerous tiles excavated from the surrounding area. Approximately 1,200 of the excavated tiles bear inscriptions that appear to be the names of people who contributed to the construction of the temple, including clans from the Seto, Kawai, and Izumi regions, such as the Tajihi clan, Hata clan, and Yatabe clan, as well as monks and ordinary people. The discovery of such a large number of ancient written documents is rare, even nationwide. A similar structure is the stone-built "zuto" tower that remains in Takahata, Nara City, but there is no other tower with a surface covered in tiles like the earthen tower at Ono-ji Temple. It was designated a national historic site in 1953.