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The vigorous Japan of the early sixteenth century still showed no signs of recreating an effective central government, but the foundation of a new form of political unity had been laid. This foundation consisted of the Daimyo domains, into which almost all of Japan was now divided. Since each domain was an effective political unit in itself, national unity could be achieved simply by establishing some form of association or accepted leadership among the Daimyo.
The realms of the Daimyo varied greatly in size, but they tended to be compact, well-defined political units, perhaps subordinate to some other feudal domain, but in any case entirely independent of the emperor or Shogun. The Daimyo himself was a paternalistic but absolute monarch within his own realm. Aiding him in his rule over the soldiers, peasants, and merchants of the principality was a class of officials and military officers, who formed the little court at the central castle of the Daimyo and lived on the hereditary salaries he assigned them and their families.