Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Tachibana Castle was a Japanese castle in Chikuzen Province, in the north of Kyushu; it is located at the peak of Tachibana Mountain, extending in part into the Higashi-ku in Fukuoka. The castle is also known as Rikka-jo, Tachibanayama-jo, or Rikkasan-jo. The castle was originally built in 1330, by Otomo Sadatoshi, Constable (shugo) of Bungo province, as a show of support to the Tachibana clan. Since it was in a tactically powerful location, looking down upon the port town of Hakata, the castle was fought over throughout the Sengoku period by the Otomo, Ouchi, and Mori clans.

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