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The Roman province of Thrace, formally annexed in 46 CE, was a strategically important region of the Roman Empire by 200 CE. Situated in southeastern Europe (modern-day Bulgaria, northeastern Greece, and European Turkey), Thrace's fertile plains supported a strong agrarian economy, producing grain, wine, and livestock. Its mountains yielded valuable minerals. Key cities served as centers of commerce and governance, connected by an extensive network of Roman roads.
Thrace’s location made it a critical frontier province, guarding the empire’s northern borders against incursions from tribes across the Danube. It also controlled vital trade routes linking the Aegean and Black Sea regions. Governed by a Roman legate, Thrace was well-integrated into the empire’s administrative and military systems.