Located in Tsuchitocho, Sakai City, Osaka Prefecture, Ono-ji Temple is a Shingon Buddhist temple and one of the 49 temples built by the high priest Gyoki during the Nara period. The remains of a pagoda remain to the southeast of the Ono-ji temple complex. The pagoda, which is shaped like a square pyramid with a side length of 53.1m and a height of over 8.6m with the top cut off, is thought to have originally been a tiled clay tower with a 13-tiered pyramid-like shape, as numerous tiles have been excavated from the surrounding area. In addition, about 1,200 of the excavated tiles have characters written on them that appear to be the names of clans, monks, and ordinary people from the Settsu-Kaizumi region, such as Tajihi-no-Muraji, Hata, and Yatabe-no-Muraji, who helped with the construction. It is said that it is rare to find such a large number of ancient written materials, even nationwide. A similar structure is the stone-built "zuto" tower in Takahata, Nara City, but there is no other tower with a surface covered in tiles like the earthen tower at Oono-ji Temple. It was designated a national historic site in 1953.