The peoples beyond the frontier threaten to overrun the provinces of Dacia and Moesia Inferior, and the new Roman emperor must race to the Danube to secure the region.

This is what Roman domains looked liked north of the Danube in 124 CE after the reorganization of the region. The empire relinquished the territory it had added to Moesia Inferior, and the Sarmatian Roxolani moved to the plains east of the Olt; there they found Dacians that had lived in the area for hundreds of years, and the two peoples coexisted peacefully. Meanwhile, Trajan’s province of Dacia was divided into three to make the region easier to administer and defend.