奥州藤原氏
During roughly the first half of that period, the "shikken" was the "de facto" military dictator of Japan (not including the independent Northern Fujiwara). The title of "shikken" was modified, as second in command to the "Tokusō" in 1256, but by the Muromachi period (1333–1573) the position, though not abolished, did not even figure in the top ranks. The position ceased to exist after the Muromachi period.