The Czech archaeologist Karel Škorpil called it Kovachoveshko kale, after the name of the nearby village, Kovachevets (at that time Kovachovets).

It is notable for its massive defensive walls which have a roughly triangular plan and enclosed an area of more than 40 hectares (app.

The strong 3.20 m thick walls were built between 308 and 324 AD during the joint reign of Roman Emperors Constantine I the Great and Licinius after the Gothic Wars of 250-269.

Cyril and St. Methodius" have revealed a huge Roman building from the 4th century AD within the walls which appears to have been a horreum (i.e. a granary).

An underground aqueduct built of clay pipes supplied the fortress with drinking water, descending from the northwest over several kilometres from Kalakoch hill.