The Inariyama Sword (known in Japanese as kinsakumei tekken; roughly, "gold-inscription iron-sword") was excavated from the burial chamber of the Inariyama Kofun, the oldest giant burial mound in the Saitama Kofun Cluster. This sword, made of iron and 73.5 cm long, has 115 characters written in gold inlay on its sides. This is the longest inscription that has been found on a sword from the Kofun Period, and it is an important historical resource in understanding ancient Japanese kingdoms. Because of the sword's incredible value, it was designated a Japanese national treasure in 1983.
The Saitama Prefectural Museum of the Sakitama Ancient Burial Mounds