Edo period thumb|Date Munenari, eighth head of the Uwajima Domain thumb|upright|Kamei Koremi, a daimyo during the bakumatsu period. The Battle of Sekigahara in 1600 marked the beginning of the Edo period. Shōgun Tokugawa Ieyasu reorganized roughly 200 daimyo and their territories into han, which were assessed by rice production. Those heading han assessed at 10,000 koku (50,000 bushels) or more were considered daimyo. Ieyasu also categorized the daimyo according to their relation to the ruling Tokugawa family: the shinpan were related to the Tokugawa; the fudai had been vassals of the Tokugawa or allies in battle; and the tozama had not allied with the Tokugawa before the Battle of Sekigahara (did not necessarily fight against the Tokugawa).
Edo period thumb|Date Munenari, eighth head of the Uwajima Domain thumb|upright|Kamei Koremi, a daimyo during the bakumatsu period. The Battle of Sekigahara in 1600 marked the beginning of the Edo period. Shōgun Tokugawa Ieyasu reorganized roughly 200 daimyo and their territories into han, which were assessed by rice production. Those heading han assessed at 10,000 koku (50,000 bushels) or more were considered daimyo. Ieyasu also categorized the daimyo according to their relation to the ruling Tokugawa family: the shinpan were related to the Tokugawa; the fudai had been vassals of the Tokugawa or allies in battle; and the tozama had not allied with the Tokugawa before the Battle of Sekigahara (did not necessarily fight against the Tokugawa)