According to so-called Gishiwajinden (The History of the Wei Dynasty) in Sangokushi (Annals of the Three Kingdoms), when Princess Himiko of Yamataikoku Kingdom dispatched envoys to Gi in 239, she was given from Emperor a golden stamp "Shingi Wao" (the title of the king of Wa (Japan)) and a hundred of bronze mirrors.
『三国志』のいわゆる「魏志倭人伝」によると、西暦239年に邪馬台国の女王卑弥呼が魏に遣使をした際、帝から「親魏倭王」金印と銅鏡百枚などを授かったという。