Oescus

Oescus, Palatiolon or Palatiolum (Bulgarian: Улпия Ескус, pronounced) was an important ancient city on the Danube river in RomanMoesia. It later became known as Ulpia Oescus. It lay northwest of the modern Bulgarian city of Pleven, near the village of Gigen.

For a short time it was linked by the longest and most famous stone bridge across the Danube, Constantine's Bridge, with the ancient city of Sucidava (modern-day Corabia, Romania).

The city seems to have at one point reached an area of 280,000 m and a population of 100,000.

Archaeological excavations have brought to light parts of the ancient city and are continuing.