Based on the story that the princess of Yamatai-Koku kingdom, Himiko was considered to be dispatched to the Wei dynasty and according to a description in the Chinese history book "Sangokushi" (Three Kingdom Saga - history book) 'Gishiwajinden' (literally, an 'Account of the Wa' in "The History of the Wei Dynasty") that in 239 the Emperor of the Wei dynasty (Three Kingdoms) gave a hundred bronze mirrors as an imperial grant to Himiko, there is the theory that Sankakubuchi Shinjukyo Mirror was the said mirror and it was produced in the Wei dynasty or Rakuro County or Taiho County (ancient counties that existed in the northern Korean Peninsula) in the Korean Peninsula.
邪馬台国の女王、卑弥呼は魏に遣使していたとされ、中国の歴史書『三国志(歴史書)』「魏志倭人伝」には239年（景初3年）魏(三国)の皇帝が卑弥呼に銅鏡百枚を下賜したとする記述があることから、三角縁神獣鏡がその鏡であり、魏、または朝鮮半島の楽浪郡・帯方郡の製作であるとする説がある。