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 .
Okazaki Castle
Saigo Tsugiyori built an earthen-walled fortification in the Myodaiji area of Okazaki, near the present castle in 1455. Matsudaira Kiyoyasu, after gaining control of the area in 1524, demolished the old fortification and built Okazaki Castle on its present location. His famous grandson Matsudaira Motoyasu (later named Tokugawa Ieyasu) was born here on December 16, 1542. The Matsudaira were defeated by the Imagawa clan in 1549, and Ieyasu was taken to Sunpu Castle as a hostage. Following the defeat of the Imagawa at the Battle of Okehazama, Ieyasu regained possession of the castle in 1560 and left his eldest son Matsudaira Nobuyasu in charge when he moved to Hamamatsu Castle in 1570. After Oda Nobunaga ordered Nobuyasu’s death in 1579, the Honda clan served as castellans. Following the relocation of the Tokugawa to Edo after the Battle of Odawara by Toyotomi Hideyoshi, the castle was given to Tanaka Yoshimasa, who substantially improved on its fortifications, expanded the castle town and developed Okazaki-juku on the Tōkaidō.