Thanks to its location at the confluence of the Sava and the Danube on the southeastern edge of the Pannonian Plain and along the northern border of the Balkan Peninsula Belgrade is linchpin for traffic between Central and Southeastern Europe and the Middle East. Therefore, Belgrade is often called the gateway to the Balkans. Most important landmarks of Belgrade is, towering over the Sava flows into the Danube, the often in history fought fortress of Belgrade.
The Romans Latinized the name Singidun to Singidunum, which probably means round fortress or round town. In the 1st century BC the Romans conquered the territories to the Danube. Besides Sirmium and Viminacium, Singidunum was an important strategic point on the Via Militaris and the Danubian limes. By 86 AD, to reinforce the frontiers at Singidunum, the Roman moved experienced Legio IV. Flavia Felix to the town, which won even more importance by the Emperor Hadrian in the appointment as Municipium and later also in the rank of a Colonia by the settlement of veterans.