The Twelfth Legion Fulminata is the large group of Roman demigods and legacies that have followed Western Civilization from Rome. The Twelfth Legion makes up most of the population of Camp Jupiter. It is the only Legion of the Roman army whose status is known as the others have disappeared and scattered after the Fall of Rome.
Established by Julius Caesar, a legacy of Venus, and nicknamed the Fulminata, or in English, "armed with lightning" since the power of the Eagle came from Jupiter himself. The Twelfth was active throughout the span of the Roman Empire, notably during the Jewish Rebellion, the miraculous siege of Alesia and the battle of Pharsalus (when Ceasar defeated Pompeius); being last mentioned in historical records 500 A.D, presumably when they went underground. The Twelfth Legion was active throughout Trajan's Dacian Wars, having been noted for gallantry in the battle for Adamclisi. Also being noted for action in Lucius Verus's war against Parthia in 162 A.D., the Twelfth Legion later occupied the frontier of the Euphrates River until the start of the 5th Century. In later centuries it came to be called commonly, the Legio Fulminatrix, the Thundering Legion.
The Twelfth was given secret orders by Jupiter himself to, in Hazel's words, "stay alive, recruit demigods and their children, keep Rome going." They have more than succeeded. The legion, two hundred or so strong, not only trains demigods, but defends New Rome populated by legion veterans and minor gods, spirits, and fauns, complete with a senate house, a forum, a model of the Colosseum, and a model of the Circus Maximus. There is also a Capitoline Hill covered with temples to the Roman gods including Jupiter Optimus Maximus, Mars Ultor, Bellona, Pluto, and Neptune.