What did Marcus Aurelius spend much of his reign doing?

• A. Spent most of his reign away from Rome protecting the borders
• B. Built a new capital in Milan
• C. Rebuilt the Senate
• D. Became emperor of Gaul

Answer: (A)

The main idea this question tests is how Marcus Aurelius spent the bulk of his reign in defending the empire, rather than pursuing domestic projects in Rome. He faced persistent threats along the Danube frontier from Germanic tribes and Sarmatian groups, and the Marcomanni and Quadi in particular required continuous military campaigns. Because of these ongoing wars, Aurelius spent many years in the provinces—Pannonia, Noricum, and Raetia—and on campaign with the legions, even dying while on a frontier expedition. This heavy focus on frontier defense explains why he was away from Rome for most of his reign.

That makes the option describing him spending most of his reign away from Rome protecting the borders the best fit. The other ideas don’t align with what dominated his rule: there wasn’t a new capital at Milan, the Senate wasn’t rebuilt as his defining project, and he did not become emperor of Gaul. Rome remained the central seat of authority, while the real work of his reign was military defense on the frontiers.