Birthright is a Dungeons & Dragons campaign setting that was first released by TSR in 1995.[1] It is based on the continent of Cerilia on the world of Aebrynis, in which the players take on the role of the divinely-empowered rulers, with emphasis on the political rulership level of gameplay. The setting revolves around the concept of bloodlines: divine power gained by heroes and passed to their descendants. Characters with a bloodline create an aura of command known as Regency, which is measured in the game using regency points or RP. Using regency, characters acquire a domain composed of provinces and holdings. The development of these domains is as much a part of the game as development of the characters. The game uses three-month domain turns to model actions of rulers over nations in much the same way as Dungeons & Dragons uses combat rounds to simulate time to model the characters’ actions in battle.