The Legion began with the capture of Edward Sallow and his scholars by the Blackfoot tribe. Sallow, drawing on his knowledge of pre-war military tactics and Roman history, transformed the Blackfoot into a powerful force. 

Conquest and Expansion:

Sallow, renaming himself Caesar, led the Blackfoot in conquering other tribes, eventually unifying them under the Legion's banner. His goal was to create a single, unified culture modeled after the Roman Empire. 

Ideology and Structure:

The Legion rejects individuality, placing emphasis on collective strength and military prowess. Men are trained as warriors, while women are assigned roles as caregivers, healers, and breeders. Slavery is a core tenet of their society. 

Conflict with the NCR:

The Legion's expansionist ambitions put them on a collision course with the NCR, a major power in the West. The conflict over resources, particularly the Hoover Dam.

Motivations and Goals:

Caesar believes the Legion's brutal methods are necessary for survival and the creation of a stable, unified society. His ultimate goal is to conquer the NCR and merge its infrastructure with the Legion's military might, creating a new, totalitarian empire.