Nagaoka Domain

 was a "fudai" feudal domain under the Tokugawa shogunate of Edo period Japan. It is located in Echigo Province, Honshū. The domain was centered at Nagaoka Castle), located in what is now part of the city of Nagaoka in Niigata Prefecture. It was often referred to as to disambiguate itself from the smaller in what is now Nagaokakyo, Kyoto. The domain was ruled by the Makino clan for most of its history. It was also the center of some of the fiercest fighting of the Boshin War, during the summer of 1868. Admiral Yamamoto Isoroku was the son of a Nagaoka samurai.
History.
The territory of Nagaoka Domain was originally part of the holdings of Takada Domain with the exception of a 60,000 "koku" holding called held by a branch of the Hori clan for their services to Toyotomi Hideyoshi. After the daimyō of Takada Domain, Matsudaira Tadateru was disgraced at the Siege of Osaka in 1616 and relieved of his holdings, Hori Naoyori was awarded with Zaodo Domain and an additional 20,000 "koku" from the former Takada lands. He quickly saw that the seat of Zaodo Domain was in a poor location prone to flooding by the Shinano River, and built a new castle on the high ground on the opposite back at what is now Nagaoka. This marked the start of Nagaoka Domain. In 1618, he was transferred to Murakami Domain, and Nagaoka was assigned to Makino Tadanari, formerly of Nagasaki Domain. In 1620, the domain "kokudaka" was raised by 10,000 "koku", and was raised again by 2,000 "koku" in 1625. The domain, which extended across the Echigo Plain from western Niigata City, through Koshi District, Santō District and Nishikanbara District was excellent rice land, and also controlled the port of Niigata with its Kitamaebune trade, and therefore the actual revenues of the domain were far in excess of its official "kokudaka". The actual revenues of the domain were 115,300 "koku" in 1712, and 142,700 "koku" in 1858 as opposed to its official rating of 74,000 "koku". Under the rule of the Makino clan, the domain was noted for its military organisation and sponsorship of training in the various military arts. During the Battle of Hokuetsu in the Boshin War, Nagaoka joined the Ōuetsu Reppan Dōmei, and was the site of fierce fighting between pro-Tokugawa forces and the imperial army. Kawai Tsugunosuke and Yamamoto Tatewaki were two senior Nagaoka commanders during the war. After the defeat of the pro-Tokugawa alliance, the domain was reduced to 24,000 "koku". In July 1871, with the abolition of the han system, Nagaoka Domain briefly became Nagaoka Prefecture, and was merged into the newly created Niigata Prefecture. Under the new Meiji government, the final daimyō of Nagaoka, Makino Tadakatsu served as domain governor, and later was a student at Keio Gijuku. His brother, Makino Tadaatsu was given the "kazoku" peerage title of "shishaku" (viscount) and served as Mayor of Nagaoka and as a member of the House of Peers.
Bakumatsu period holdings.
As with most domains in the han system, Nagaoka Domain consisted of several discontinuous territories calculated to provide the assigned "kokudaka", based on periodic cadastral surveys and projected agricultural yields.