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 .
Morioka Castle
During the late Sengoku period, Nanbu Nobunao pledged fealty to Toyotomi Hideyoshi at the Siege of Odawara (1590) in 1590 was confirmed as "daimyō" over all of the Nanbu territories, including lands around the site the site of old Kozukata Castle in Morioka. He decided to move his seat south from its former location at Sannohe Castle and to erect a new castle at Morioka. The design of the castle may have been influenced by Nagoya Castle in Hizen Province, which he saw during the Japanese invasions of Korea. His holdings were confirmed after the Battle of Sekigahara by Tokugawa Ieyasu, and Morioka remained the seat of the Nanbu clan until the Meiji Restoration.