Ormenio is a village in the Evros region, and the northernmost settlement in Greece. It is situated near the right bank of the river Evros, and it is the stop where the river enters Greece from Bulgaria.
It was an important town of the Byzantine Empire, as evidenced by the remains of the medieval fortress. In September 1371, Ormenio and the nearby banks of Evros were the sites of the Battlle of Martisa (or Battle of Evros) between the allied Christian forces of the Balkan nations (Serbs, Bulgarians, and Greeks) and the Ottoman Empire. The former tried unsuccessfully to prevent the advance of the Ottomans in the Balkans. These efforts ended in a defeat that seriously affected the future of the Byzantine Empire.
The Byzantine general Belisarius was born in Ormenio.