In ancient geography, especially in Roman sources, Dacia was the land inhabited by the Dacians. The Greeks referred to them as the Getae, which were specifically a branch of the Thracians north of the Haemus Mons (the Balkan Mountains).
For the remainder of Domitian's reign Dacia remained a relatively peaceful client kingdom, but Decebalus used the Roman money to fortify his defences. Domitian probably wanted a new war against Dacians, and reinforced Upper Moesia with two more cavalry units brought from Syria and with at least five cohorts brought from Pannonia. Trajan continued Domitian's policy and added two more units to the auxiliary forces of Upper Moesia, and then he used the buildup of troops for his Dacian wars.