Tozama were 'outside' daimyo (lords) in Edo period Japan, not remotely belonging to the band of warriors, not connected to Tokugawa Ieyasu and not involved in the politics which concerned the Tokugawa government. Tokugawa Ieyasu had treated the great Tozama vassals with amaiability but later, between 1623 and 1626, Tokugawa Iemitsu was tolerant of them. Particularly in the west of Japan, the Tozama daimyo heavily profited by foreign trade in the mid 17th century. Their growing success was a threat to the Bakufu (Shogunate). The Bakufu, while having many other problems with rivalry such as religion, responded by preventing the ports of West Japan and Kyushu from trading. Daimyo Matsudaira Katamori visits the residence of a retainer. ... The Edo period (江戸時代, Edo-jidai) is a division of Japanese history running from 1600 to 1867. ... Shogun Tokugawa Ieyasu Tokugawa Ieyasu (previously spelled Iyeyasu); 徳川 家康 (January 31, 1543 – June 1, 1616) was the founder of the Tokugawa bakufu of Japan which ruled from the Battle of Sekigahara in 1600 until the Meiji Restoration in 1868. ... Events August 6 - Pope Urban VIII is elected to the Papacy. ... Shogun Tokugawa Iemitsu Tokugawa Iemitsu (previously spelled Iyemitsu);(1604 - 1651) was the third shogun of the Tokugawa dynasty who reigned from 1623 to 1651. ... In Japanese history, a shogun (将軍 shōgun) was the practical ruler of Japan for most of the time from 1192 to the Meiji Era beginning in 1868. ... Kyushu region, Japan Kyushu (九州) is the third largest island of Japan and most southerly and westerly of the four main islands. ...