Legio XII Fulminata
Legio duodecima Fulminata (Twelfth Legion, armed with lightning), also known as Paterna, Victrix, Antiqua, Certa Constans, and Galliena, was a Roman legion, levied by Julius Caesar in 58 BC and which accompanied him during the Gallic wars until 49 BC. The unit was still guarding the Euphrates River crossing near Melitene at the beginning of the 5th century. The legion's emblem was a thunderbolt (fulmen). In later centuries it came to be called commonly, but incorrectly, the Legio Fulminatrix, the Thundering Legion.
Read more about Legio XII Fulminata: Under Caesar, Against The Parthians, Great Jewish Revolt, Defending The Eastern Frontier, Modern References