The Heian period (平安時代 Heian jidai) is the last division of classical Japanese history, running from 794 to 1185 A.D.
According to “Wikipedia Heian_period”
Almost Japanese study the Ancient Japanese( language of Heian period ) in highschool .
the Ancient Japanese is quite different from Japanese.
Miku Hatsune tried to sing AKB48 song in Ancient Japanese.