In the second and third centuries CE, what group emerged as the greatest threat to the Roman empire?

Question

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The Germans emerged as the greatest threat to the Roman empire in the second and third centuries CE. Germanic tribes such as the Visigoths, Ostrogoths, Vandals, and Franks posed a significant challenge to the Roman army, and eventually contributed to the downfall of the Western Roman empire. Though the Persians were also a formidable enemy of Rome during this period, they were primarily a threat in the Eastern part of the empire, and did not pose as direct a threat to Rome's heartland as the Germanic tribes did. The Egyptians and Greeks were not significant military threats to Rome during this period.

In the Second and Third Centuries CE, What Group Emerged