the power of the japanese imperial court (that is, the emperor, his ministers and other important persons) rose. this period is also famous for its art, poetry and literature. japanese culture also became japanese way.the language used in this period was called late old japanese. the writing systems known as kana emerged at this time. by the end of this period (that is, by the end of the 12th century), a number of groups came into being. these groups were highly armed and they fought among themselves. the situation was like a civil war, that is, war among different sections of society. finally, groups of people called samurai led society under the political rule of a shogun. the heian period ended due to the genpei war.