There is the oldest Queen HIMIKO’s Ancient tomb at YAMATAIKOKU at Nara prefecture in JAPAN in 2th or 3th century AD, ancient times.
http://headlines.yahoo.co.jp/hl?a=20130220-00000123-san-cul (Japanese news)
Researcher of archaeology studied the ancient tomb. Queen HIMIKO was powerful shaman and used mojo.
But We do not know about her clearly. She sent messenger to GI of china, GI sent SHIN-GI-WA-OU gold seal to Queen HIMIKO.
She is very famaous historical character in Japan. Example, There is Manga character of HI-NO-TORI (its means Firebird or phoenix) written by Osamu Teduka.
Japanese first emperor(TENMU or JITO) came into existence 7th century AD.