Caesar's Legion

Comprised mostly of reconditioned tribals and their offspring, Caesar’s Legion is a huge slaving organization that used to operate east of the Grand Canyon. Led by the charismatic and cunning “Caesar" (a former Follower of the Apocalypse), the legionnaires are a well-organized fighting force and absolutely merciless in their slavery. Mimicking the ancient traditions of the Roman Empire, the legionnaires dress in segmented football pad armor and decorated football helmets. Caesar attempted to destroy NCR’s presence in the east, and actually succeeded in destroying one of their major fortifications, Fort Aradesh. When Caesar attempted to take Hoover Dam, however, the legion was badly defeated. Since that time, Caesar has moved east of Texas, past the legendary cyclones that rage for most of the months of the year. Despite this, packs of his legionnaires still operate in the southwest, collecting tribute from tribes in the form of goods and slaves.

One of their ranks is called Vexillarius. They have been known to fight the forces of the tribal "goddess" called Hecate. The Hanged Man also had some ties to the Legion. Some of the Legion's outposts were located in Denver and Fort Abandon.

Denver camp
The Denver Legionnaires are camped out in a hotel in south Denver with some slaves they've rounded up. Every couple of weeks they send a pair of fast guys out east to see if the radioactive dust storms have subsided for the season. Once they do, they'll head out.

They have the lower floors secured with chain link fence and barriers made of junk. They keep the dogs away with chemical repellent sprayed in the area (resprayed every year when they return here). They're well-armed (as far as wastelanders go) and alert. They stay on the 2nd level, though they are watching their surroundings (they'll be alert to your arrival unless you manage to sneak your way in) and might have a sniper hiding out on the ground floor. They keep the slaves locked in rooms on the 2nd and 3rd floor.

Appearances in games
The Legion was initially (when Chris Avellone still worked on the project) to play a significant role in Van Buren (Black Isle's Fallout 3), but they were mostly cut out because the game was getting too big, although they had some minor appearances in the game. Black Isle planned to give them a major role to play in Fallout 4. It is not certain if they will appear in any future Fallout game.