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Legio XXII Primigenia ("Fortune's Twenty-Second Legion") was a legion of the Imperial Roman army dedicated to the goddess Fortuna Primigenia. Founded in AD 39 by the emperor Caligula for use in his campaigns in Germania, the XXII Primigenia spent much of their time in Mogontiacum (modern Mainz) from up to the end of the 3rd century. The legion's symbols were a Capricorn and the demigod Hercules.
XXII Primigenia was first stationed in Mogontiacum in the Roman province of Germania Superior, guarding the Rhine border as part of the limes. Along with the rest of the Germanic army, the legion supported Vitellius in the Year of the Four Emperors (69). During the Batavian rebellion, XXII Primigenia, commanded by Gaius Dillius Vocula, was the only Germanic legion that survived rebel attackss and which stayed in its camp, defending Moguntiacum. They remained in Moguntiacum until at least the 3rd century. Hadrian, prior to becoming Emperor, was tribunus militum of the XXIIth in 97-98.
Around 90, units of the XXII was garrisoned in or around the area of modern-day Butzbach, as part of the Limes Germanicus (a series of forts along the Roman frontier of Germania Superior. A stamp of the XXII Legion was found during excavations of a Roman Fort in Butzbach. The 22nd U.S. Infantry Regiment was stationed in Butzbach after World War II, and the stamp of the Legion and the emblem of the American unit were very similar.
The Rhine settlement was their main camp, but vexillationes of the legion participated in the building of the Antonine Wall in Scotland (2nd century) and in the campaigns against the Sassanid Empire (around 235).
They were still in Moguntiacum during the attack of the tribe of the Alamanni in 235, and were responsible for the lynching of Emperor Alexander Severus when he tried to negotiate with the enemy, along with the subsequent election of Maximinus Thrax as new emperor.
In 268, Primigenia probably fought under Gallienus at the Battle of Naissus, winning a victory over the Goths. The following year, the XXII Legion rebelled against Postumus, and proclaimed its commander Laelianus Emperor of the Gallic Empire.