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Claudius II, also called Claudius Gothicus, was a Roman emperor who reigned from 268 to 270 AD. He was a successful military commander and is best known for his victory over the Goths in the Battle of Naissus in 268, which earned him the title "Gothicus." Claudius' reign was short-lived, but he left a lasting impact on the Roman Empire, initiating reforms in administration, taxation, and the military.