When Shinjukyo (the mirror engraved divine beasts) was discovered in the Tsubaiotsukayama-kofun Tumulus in Yamashiro-cho, Kyoto Prefecture (Kyoto Prefecture) (currently, Kizugawa City) in 1953, Yukio KOBAYASHI focused on the fact that the same form of mirrors were discovered in the various places in Japan and advocated Yamatai-Koku kingdom located in Yamato and the process of the establishment of an ancient government that Shinjukyo granted to Himiko by later Yamato sovereignty (the ancient Japan sovereignty) were given to Gozoku (local ruling family) in the various places.
1953年（昭和28年）、京都府山城町(京都府)（現・木津川市）の椿井大塚山古墳から神獣鏡が出土すると、小林行雄は同型の鏡が日本各地の古墳から出土している事実に着目し、邪馬台国が大和に所在し、のちのヤマト王権が卑弥呼に下賜された神獣鏡を各地の豪族に与えたとする古代政権成立過程を提唱した。