"Shomonki" is an early war chronicle that details TAIRA no Masakado's War, which occurred in Togoku (the eastern part of Japan, particularly the Kanto region) in the middle of the tenth century.
『将門記』（しょうもんき）は、10世紀半ばに東国でおこった平将門の乱の顛末を描いた初期軍記物語。