Via Militaris
Via Militaris or Via Diagonalis was an ancient Roman road, starting from Singidunum, passing by Danube coast to Viminacium, through Naissus, Serdica, Philippopolis, Adrianopolis, and reaching Constantinople. This road was connected with Via Egnatia by other roads - the road along river Axios, the Serdica–Thessalonica road along river Strymon, and the road Philippopolis–Philippi.
It was built in the 1st century AD. The length from Singidunum to Constantinople was 924 kilometres.
During the first European conquests of Ottoman Turks orta kol was following the Via Militaris.
In May 2010, while work was done on the Pan-European Corridor X in Serbia, well-preserved remains of the road were excavated in Dimitrovgrad, Serbia. The eight-metre wide road was constructed from large blocks of stone and had two lanes.| Ancient name | Location |
| Singidunum | Belgrade, Serbia |
| Gratiana | Dobra, Serbia |
| Viminacium | Kostolac, Serbia |
| Naissus | Niš, Serbia |
| Remesiana | Bela Palanka, Serbia |
| Serdica | Sofia, Bulgaria |
| Philippopolis | Plovdiv, Bulgaria |
| Hadrianopolis | Edirne, Turkey |
| Arcadiopolis | Lüleburgaz, Turkey |
| Byzantium | Istanbul, Turkey |
