Many years ago the Daimyo of the Ryoshun Family led his clan, the Sishi, to battle, unifying the many disparate clans of Nihon through physical prowess and social charms. He was subsequently named Shogun by the then-Emperor and in the years to follow his clan would take on his name.
That was quite some time ago, however. The Ryoshun Shogunate is still as well-known for its military might and the stiff and formal manner in which its Samurai conduct themselves. Lesser known is the many dishonorable tactics they are willing to stoop to, in pursuit of maintaining their goals and position.