Where did Marcus Aurelius conduct many of his military campaigns?

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Bronze equestrian statue of Marcus Aurelius with his right arm raised, seated on a horse, at Piazza del Campidoglio in Rome, Italy. — Marcus Aurelius Marcus Aurelius, bronze equestrian statue in the Piazza del Campidoglio, Rome.

Marcus Aurelius conducted many of his military campaigns along the Danube frontier to defend the Roman Empire against invading Germanic tribes, such as the Marcomanni and the Quadi.12

During his reign, he spent significant time in the field, including years of campaigning in Bohemia to restore and secure the northern boundaries. While the war against the Parthians in the East (162–166) occurred during his reign, it was nominally under the command of his coemperor, Lucius Verus, and executed by subordinate generals. Later, Marcus also undertook a tour of pacification in the East following the rebellion of Avidius Cassius.13