Seiseifu fortress of the Southern Court was defeated by Sadayo IMAGAWA (Ryoshun) who was dispatched by Muromachi bakufu (Japanese feudal government headed by a shogun) and the Shoni clan restored Dazai-fu, but outcast by the Ouchi clan in the Sengoku period (period of warring states).
南朝方の征西府は室町幕府が派遣した今川貞世（了俊）に敗れ、少弐氏は大宰府を回復するが、戦国時代(日本)には大内氏に追われた。