Caesar's Legion uses two old forms of currency which were also used in Roman times. They are minted by the Legion in the form of silver and gold coins, each coin bearing the profile of Caesar. Despite Caesar's poor relations with the other factions in New Vegas, Legion currency is still accepted as payment in the Mojave Wasteland, owing to the high level of trade with the Legion and the safety of its territory for caravans. The exchange rate is 4 bottle caps to 1 Denarius, and 100 bottle caps to 1 Aureus.
The Denarius (silver), which bears an image of a younger Caesar on the obverse and Caesar, Joshua Graham and Calhoun on the reverse. The inscriptions are in Latin, "Caesar Dictator" meaning "Dictator Caesar" or "Absolute Ruler Caesar" on the front and "Magnum Chasma" meaning "Great Abyss" or "Great Fissure" on the back, referring to the Grand Canyon. The symbolism is simple - the denarius commemorates young Caesar's journey to the Canyon and his first victories as a dictator of the tribes.
Legion Denarius, mangled - a variant which can be found on the bodies of enemies injured with the 12 gauge coin shot crafted ammunition. Despite the description, it appears identical to the normal Legion Denarius, but is worth only half the value: 2 caps instead of 4.
Non-currency item versions of Legion Denarius exist within the game files of Fallout: New Vegas, but were not included in the final game. These versions are identical to the standard currency, but their trade value is affected by the player's Barter skill.
The Denarius is one of two forms of currency used by Caesar's Legion, the other being the Legion Aureus. Of the two, the Denarius is both the least valuable and the most commonly found.
As with any form of currency in Fallout: New Vegas, Legion Denarius is not affected by the player's Barter skill. The currency will always be valued at 4 caps, regardless of whether the player is buying or selling.
The Legion Denarius does not show up when the items are sorted into item type on the container menu. It only shows up when the items are sorted back alphabetically on the container menu.