When Wizards of the Coast published the latest edition of Oriental Adventures, it included Rokugan as the official "sample setting." Rokugan is best known for being the setting of the Legend of the Five Rings (L5R) collectible card game and Roleplaying Game, which are published by The Alderac Entertainment Group (AEG). However, shortly after the publication of Oriental Adventures, AEG obtained all the publishing rights to all L5R properties. For a brief time, AEG published supplements that featured both L5R and D20 based mechanics. However, development of all D20 based Rokugan material has recently ceased, as Oriental Adventures is now out of print, and AEG has decided to focus solely on L5R based supplements for the next edition of The Legend of the Five Rings Roleplaying Game.
The Empire of Rokugan
Rokugani society is based on a clan structure, with seven (and later eight) so-called "Great Clans", as well as a number of minor clans. Great Clans are made up of several family lines, each with their own general purpose within the clan. Minor clans, on the other hand, generally only have one family. Each clan also has areas of land bequeathed by the emperor under their control. The emperor retains ownership off all lands, however, and the clans essentially rent the lands they use by paying taxes annually.