In Games Workshop's Warhammer Fantasy fictional universe, Bretonnia is a country located west of the Empire, between the Grey Mountains and the Great Ocean in the lands that were once part of the domain of the Elves. It was modelled in many ways on High Medieval France, Britannia, England and on the Arthurian legends.The Knights of Bretonnia are divided into four categories. Knights Errant are young sons of nobles who must prove themselves in battle. Grail Knights are the most powerful and revered individuals in all of Bretonnia, second only to the Lady. They are living saints who represent the fearsome power of Bretonnia and answer only to the Lady herself.

The kingdom of Bretonnia is made up of the following 14 dukedoms Couronne, L'Anguille, Artois, Lyonesse, Mousillon, Gisoreaux, Montfort, Bastonne, Bordeleaux, Aquitaine, Parravon, Brionne, Quenelles and Carcassonne. The Forest of Loren is within the borders of Bretonnia but considered to be the forbidden realm of the Wood Elves.The Land of Bretonnia is a feudal, traditional society where the peasants serve the knights in return for protection, while the knights are bound to militarily serve their lords in return for certain rights and titles. Beneath the Kings are the Dukes. Beneath them is another layer of nobility, the Earls and Barons in respective order.The Knights' forces typically consist of the stronger Men-at-Arms and the more lowly Bowmen levies. The lands of Bretonnia are also ruled by spiritual and mystical leaders, the Fay Enchantress, her Damsels, and the Grail Knights, who are all faithful servants to the Lady of the Lake.