Karatsu, Saga
Due to its proximity to mainland Asia, Karatsu has long been known as a stopover to Korea and China.Under ritsuryō, the current city area was part of the Hizen Province. In 1591, on the coast of the northern part of the city (formerly the town of Chinzei), Nagoya Castle was constructed. The following year, it became the location from which the Imjin War was launched by Toyotomi Hideyoshi. In the middle of 1593, Terasawa Hirotaka created the Karatsu domain and began governing it. In 1602, replacing Nagoya Castle, Karatsu Castle was constructed in what is now the heart of Karatsu. The tower of Karatsu Castle was built in 1966 .
Hachinohe Castle
Hachinohe Castle was constructed in 1627, but styled as a "jin'ya" due to restrictions set by the Tokugawa Shogunate, which permitted only one castle per domain. It had two sets of concentric moats, and a two-story central structure with a barracks, but no donjon. It became the headquarters of the new Hachinohe Domain in 1664. From 1827-1829, the 8th "daimyō" of Hachinohe, Nambu Nobumasa, constructed a new palace in the inner bailey, as well as a martial arts training school in the second bailey. In 1838, Hachinohe Domain was upgraded in rank by the Shogunate, and for the first time Hachinohe Castle was officially styled as a “castle”.