Slovakia in the Roman era
The reign of Augustus (27 BC - 14 AD) began a long period known as the Pax Romana, or Roman peace. Despite continuous wars on the frontiers, and one year-long civil war over the imperial succession, the Mediterranean world remained at peace for more than two centuries. Augustus enlarged the empire dramatically, annexing Egypt, Dalmatia, Pannonia, and Raetia, expanded possessions in Africa, and completed the conquest of Hispania.
By the end of his reign, the armies of Augustus had conquered the Alpine regions of Raetia and Noricum (modern Switzerland, Bavaria, Austria, Slovenia), Illyricum and Pannonia (modern Albania, Croatia, Hungary, Serbia, etc.).
Cottius
The Roman alliance was established in 13 or 12 BC, and is attested in an inscription in the Arch of Susa, which was erected to commemorate this agreement between 9 and 8 AD. Augustus attended its unveiling. By it Cottius became a client king of Rome, with his authority was reduced in exchange of the retention of his autonomy. While deferring authority to Augustus, he continued to hold his hereditary position in his land. Millar called such an arrangement as a dual sovereignty. Cottius became a Roman citizen, Latinising his name as Marcus Julius Cottius, and was appointed "præfectus civitatium". Areas assigned to this type of prefect were areas newly brought under Roman administration in the Augustan period. These officials oversaw areas with a number of tribes and had a fixed term of office. However, this post in Cottia was permanent and hereditary.