The iron Inariyama burial-mound sword or kinsakumei tekken (金錯銘鉄剣) was excavated in 1968 at the Inariyama Kofun, a megalithic tomb located in Saitama Prefecture. In 1978, X-ray analysis revealed a gold-inlaid inscription that comprises at least 115 Chinese characters. This sword was described as the discovery of the century for the study of ancient Japanese history. The sword is designated a national treasure of Japan and is on display in the Saitama Prefectural Museum of the Sakitama Ancient Burial Mounds.