This is the 8332nd most frequent Japanese word.
征夷大将軍
"Seii Taishogun" means "Commander-in-Chief of the Expeditionary Force Against the Barbarians," a title given to military dictators in feudal Japan.
This demonstrates '征夷大将軍' as a historical title referring to the leader of shogunate Japan.
征夷大将軍は日本の歴史で重要な役割を果たしました。
The Shōgun played a vital role in Japanese history.
Here '征夷大将軍' is used to indicate the starting point of someone holding the position as Shōgun.
江戸時代には徳川家康が初代の征夷大将軍となりました。
During the Edo period, Ieyasu Tokugawa became the first Shōgun.
In this context, '征夷大将軍' refers to the political and administrative figurehead role of the title in society.