You're right! "Taira no Kiyomori" was the great leader of Taira clan.
The Gempei War (1180-1185) was a conflict between the Taira and Minamoto clans in Heian period Japan. Taira clan is finally completely destroyed in 1185, in the great sea battle of Dannoura.
JAPAN changes Japanese history chronological table, the year when the Kamakura period began. The most generally accepted theory determines the year of the beginning of the Kamakura period as "1185", the year when Minamoto clan destroyed the Taira clan.
