The Time Of Blades and Magic
Rokugan was the centre of the Legend of the Five Rings, and it’s Empire was similar to that of feudal Japan. It also included aspects of other Asian cultures, as well as magic and mythical beasts.
Rokugani society was based on a clan structure, with seven (later eight) so-called Great Clans, as well as several minor clans. Each clan had areas of land bequeathed to them by the emperor, which they were tasked with maintaining. The emperor retained ownership of all lands, however, and the clans essentially rented the lands they used by paying taxes annually.
There was no given name for the entire world which Rokugan was a part of, but the name of Rokugan could sometimes be used to refer to the entire world. Strictly speaking this was incorrect, but as the Emperor had a rightful claim to all that was as a right of being the descendant of Amaterasu and Onnotangu, the courtiers of the Emerald Empire saw this as an appropriate use. The citizens and rulers of the Burning Sands and Ivory Kingdoms might disagree, however.
The nation of Rokugan was divided into varying sized provinces, each controlled by distinct groups. The largest groups, and the largest areas, were controlled by the clans of Rokugan — groups of families descended largely from a common ancestor who inherited control of their respective tracts of land, as well as the people living on them.