Hamamatsu Castle (Hamamatsu-jo) was where the founding shogun of the Edo period (1603-1868), Tokugawa Ieyasu, lived for 17 years before he became ruler of Japan. As he lived in the castle during the time when he began a war for the purpose of uniting the whole country, it was also named the Castle of Advancement. https://www.jnto.go.jp/eng/spot/castles/hamamatsu.html

Since the Edo era, Kokura has flourished as a castle town. Kokura Castle, the symbol of the town, was founded by Tadaoki Hosokawa in 1602. The only castle remaining in Fukuoka Prefecture, it attracts many tourists. http://www.city.kitakyushu.lg.jp/english/file_0066.html