From the back of the box:

Daimyō was the highest feudal rank or title in Japan between the 12th and 19th centuries. In his position as powerful warlord, the player must lead his clan in order to conquer new fiefs, called Hans, to increase his political and economical prestige and to resist the danger represented by the other feudal Warlords. Daimyō is a game of strategy set in feudal Japan for 2/4 players of 12 years and over.