Muromachi period

The Kyōtoku Incident was a long series of skirmishes and conflicts fought for control of the Kantō region of Japan in the 15th century.... The conflict began in 1454 with the assassination of Uesugi Noritada by Kantō kubō Ashikaga Shigeuji. The Ashikaga, Uesugi, and other clans then leapt to battle, either defending or assaulting Shigeuji. The chaos ended in 1482, when a peace was negotiated. Ashikaga Shigeuji was appointed to the post of Kantō kubō in 1449, the first Ashikaga to hold the post since his father's death ten years earlier. At that point, in 1439, Uesugi Norizane had seized power for his clan. Ten years later, the Uesugi remained powerful in the Kantō; in 1454, Shigeuji arranged to have his deputy, Uesugi Noritada, killed. This was taken as rebellion against the shogunate, and armed conflict quickly broke out. The Uesugi clan mobilized to attack Shigeuji, and Imagawa Noritada, loyal to the shogunate, captured and burned Kamakura, which was the center of the Kantō bureaucracy and Shigeuji's home. Shigeuji then fled the area, to Koga, in Shimotsuke province, and became known as the Koga kubō.
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