Europe 107: Trajan’s Iazygan War
Following his victory over Dacia (106), Trajan refused to restore territory the Iazyges had lost to the Dacians a few years earlier. In response, the Iazyges declared war on the Romans but were defeated (107–108). However, after the war, the Iazyges expanded into northwest Dacia (possibly as compensation by the Romans).
11 Aug 106 Roman Dacia▲
With the defeat of the Dacian king Decebalus, Trajan annexed Dacia to the Roman Empire. The core Dacian territory immediately became the imperial province of Dacia, also called Dacia Traiana, and was opened up to Roman colonization. The more restive eastern and western territories—where the Romans still faced some resistance in 107—were annexed to the provinces of Upper and Lower Moesia.
106? Upper and Lower Pannonia▲
Sometime between 102 and 107 the Roman emperor Trajan divided Pannonia into two imperial provinces: Pannonia Superior (Upper Pannonia) and Pannonia Inferior (Lower Pannonia). It is probable that this partition was related to the increased distribution of legions on the Danube frontier during and after the Second Dacian War. In 106 Hadrian became praetorian legate of Lower Pannonia, which regained territory it had earlier (86 AD) lost to Upper Moesia.
107–108 Trajan’s Iazygan War▲
Before the Second Dacian War, the Dacians had seized Oltenia from the Roman client kingdom of the Iazyges. However, following the Roman conquest of Dacia, Trajan refused to return Oltenia to the Iazyges, prompting the latter to declare war in 107. Under the command of the future emperor Hadrian, then governor of Lower Pannonia, the Romans brought the Iazyges to terms the following year, but may have granted them possession of the Banat—which the Iazyges soon occupied—in exchange for their loss.