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 (but did not necessarily fight against the Tokugawa). The
shinpan were collaterals of Ieyasu, such as the
Matsudaira, or descendants of Ieyasu other than in the main line of succession. Several
shinpan, including the Tokugawa of
Owari (
Nagoya),
Kii (
Wakayama), and
Mito, as well as the Matsudaira of
Fukui and
Aizu, held large
han. A few
fudai daimyō, such as the
Ii of
Hikone, held large
han, but many were small. The shogunate placed many
fudai at strategic locations to guard the trade routes and the approaches to
Edo. Also, many
fudai daimyo took positions in the Edo shogunate, some rising to the position of
rōjū. The fact that
fudai daimyo could hold government positions, while
tozama in general could not, was a main difference between the two.
Tozama daimyō held mostly large fiefs far away from the capital, with e.g. the
Kaga han of
Ishikawa Prefecture, headed by the
Maeda clan, assessed at 1,000,000
koku. Other famous
tozama clans included the
Mori of
Chōshū, the
Shimazu of
Satsuma, the
Date of
Sendai, the
Uesugi of
Yonezawa, and the
Hachisuka of
Awa. Initially, the Tokugawa regarded them as potentially rebellious, but for most of the Edo period, control policies such as
sankin-kōtai, resulted in peaceful relations. Daimyo were required to maintain residences in Edo as well as their fiefs, and to move periodically between Edo and their fiefs, typically spending alternate years in each place, in a practice called
sankin-kōtai. ==After the Meiji Restoration==