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Legio undevigesima ("Nineteenth Legion") was a legion of the Imperial Roman army. It was founded in 41 or 40 BC by Octavian, the future emperor Augustus. It was destroyed in 9 AD in the Battle of the Teutoburg Forest. The emblem of the XIXth legion is unknown, but probably was the Capricorn like other legions levied by Augustus.
In 30 BC, veterans of the XIX legion were settled near Pisa, and after that, the rest of the legion was allocated in the Rhine frontier with base camp at Cologne. The XIX legion participated in the German campaigns of Drusus (13–9 BC) and Tiberius (8–5 BC). By the year 5 BC Germania was a Roman province and Publius Quinctilius Varus was assigned as governor.
In September 9, Arminius, leader of the Cherusci and a Roman ally, set a trap. He had reported a major revolt of one of the western tribes and suggested the return of both governor and his legions to the Rhine. Varus accepted the suggestion and went with the XVII, XVIII and XIX legions. The army was trapped near Osnabrück and was completely destroyed in the Battle of the Teutoburg Forest. Between 16 and 18, Germanicus, the leader of the Rhine armies, looked for the remains of the legions.
After its destruction, the Romans never used this legion number again.