In the han system, Hirado was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields.[2] In other words, the domain was defined in terms of kokudaka, not land area.[3] This was different from the feudalism of the West.
History
After Toyotomi Hideyoshi’s successful conquest of Kyushu, local warlord Matsura Shigenobu was confirmed in Hirado County, Iki Island and Hario Island to be his domain. During the Japanese invasions of Korea, Hirado was a forward base of operations for Japanese forces. In 1599, Matsura Shigenobu erected a castle called Hinotake-jō on the site of the present-day Hirado Castle. However, he burned the castle down himself in 1613, as a gesture of loyalty towards ShōgunTokugawa Ieyasu, having served in the losing Toyotomi side during the Battle of Sekigahara. In return, he was allowed to retain his position as daimyō of Hirado Domain under the Tokugawa bakufu.
The present Hirado Castle was constructed in 1704 by order of the 5th daimyō of Hirado domain, Matsura Takashi with the assistance of the Tokugawa shogunate to be the keystone in seaward defenses of Japan in the East China Sea region, now that the country had implemented a policy of national seclusion against western traders and missionaries. Also during the period of Matsura Takashi, a subsidiary domain (Hirado Shinden Domain) of 10,000 koku was created for his younger brother, Matsura Masashi. Matsura Takashi served in a number of important posts in the Tokugawa Shogunate, including that of Jisha-bugyō, a post traditionally reserved only for fudai daimyō. However, his expenses in rebuilding Hirado Castle all but bankrupted the domain.