A shogun was a very important person in ancient Japan who had control over the country's government and military.
In history books or movies about Japan, you might hear people talking about a particular shogun as if they were famous leaders. That's because being a shogun meant holding a lot of power - it was like being an emperor without actually being one. Think of it like having a title similar to king or president, but also being responsible for making sure the country runs smoothly and safely.
The supreme generalissimo of feudal Japan.
