Legio XII Fulminata, its name means 'the lightning legion'.
There is a strange story that the twelfth legion or probably a sub-unit participated in the Emperor Marcus Aurelius' war against the Quadi. During a hot summer in either 172 or 174, the legion had become surrounded by enemies in a place where no water was to be found. Christian authors later believed that the prayer of Christian soldiers had caused the saving rains; others thought that an Egyptian magician named Harnuphis had done the job.
After the murder of the emperor Publius Helvius Pertinax in 193, civil war broke out. XII Fulminata sided with Pescennius Niger the governor who Syria who proclaimed himself emperor. This was a fatal mistake: in 194, Niger was defeated by Lucius Septimius Severus at Cyzicus, the Cilician Gate and Issus.
During the reign of Lucius Septimius Severus, the eastern border was moved from the Euphrates to the Tigris. Like XVI Flavia Firma, XII Fulminata, which had been a frontier guard for more than a century, became now the strategic reserve behind the frontier line. This was not a very honorable position, and may have been a punishment for its behavior during the civil war.