Sure, I'll do my best
Ok, I saw that the timeframe of Millenium A.D. is from 476 A.D. till 968 A.D.
So it means that it comprises 4 periods of Japanese history:
古墳時代 : Kofun-jidai (approx. 300 -552) [A.D.] (maybe too early?)
飛鳥時代 : Asuka-jidai (552-710)
Note: Instead of Asuka and Kofun, you can simply say 大和時代 Yamato-jidai (250-710)
奈良時代 : Nara-jidai (710-794)
平安時代 : Heian-jidai (794-1192)
note: jidai, basically means era or period in japanese
Not sur