Shogun

A ‘Shogun’ (将軍), is the short form of the official title Sei-i taishōgun (征夷大将軍) meaning “great general who subdues the eastern barbarians”.

This was a military rank designating someone as the military deputy of the Emperor of Japan, the Tennō (天皇). This title originates from 794 during the Heian period, and originally referred to the commanders leading campaigns in Northern Japan against the Ainu. Bakufu - New World Encyclopedia (n.d.)

Shoguns were originally subordinate to the Emperors and the Imperial court, their duties being limited to fighting wars and law enforcement. But during several periods in Japanese history such as the Kamakura Period from 1185 to 1333, (briefly during) the Muromachi/Ashikaga period from 1336 to 1573, and finally during the Tokugawa period from 1603 to 1868, shoguns from the Minamoto, Ashikaga and Tokugawa clans served as de-facto rulers of Japan, albeit with varying degrees of authority and actual control of the country. Szczepanski (2020)