지쿠젠 국
In the early Edo period, Kuroda Nagamasa, appointed the lord of Chikuzen Province, and most of his samurai vassals lived in Fukusaki, on the opposite shore of the Naka River from Hakata. Kuroda Nagamasa changed the name of the area to Fukuoka after his home town; Fukuoka in Okayama Prefecture. He ordered Tachibana Castle and Najima Castle dismantled, and had Fukuoka Castle built using the stones from those older castles. At that time Hakata was no larger than one square kilometer, demarcated by defensive lines along the Naka River, the Boshu-bori (or Boshu Canal), and the Ishido or Mikasa River.