The Palmatis Fortress is a Late Antiquity and medieval city and fortress located near the town of Onogur, Tervel Municipality, in Northeast Bulgaria. It lies at an almost equal distance from the Danube city of Silistra (ancient Durostorum / medieval Drastar) and Dobrich – nearly 50 km from each.
It is situated on a plateau with natural defenses provided by the bed of the Suhata Reka, (i.e. the Dry River) which surrounds it from the south, east, and north. The walls of the Palmatis Fortress in the fourth directions are between 200 and 600 meters long. The fortress proper was surrounded with ramparts (embankments) with moats forming in fact an outer fortress wall.
During the Late Roman and Early Byzantine period, the Palmatis Fortress was located on the ancient road from Durostorum (Durustorum), today’s Silistra on the Danube, to Marcianopolis (or Marcianople), today’s town of Devnya near the Black Sea city of Varna (ancient Odessos). Palmatis was also a functioning fortress during the time of the First Bulgarian Empire (632/680-1018).
In the Late Antiquity (4th-6th century AD), near the Palmatis Fortress, in an area called Shan Kaya (not to be confused with the rock shrine of Shan Kaya in the Rhodope Mountains in Southern Bulgaria), there was an Early Christian rock monastery which was part of a large Early Christian monastic colony centered in the rock monastery near the Bulgarian town of Balik, Krushari Municipality, Dobrich District (which is still known today by its derogatory and offensive Turkish name “Gaiour (Gavur) Evleri” meaning “Homes of the Infidels”, as the original name of the holy place remains unknown).
The rock monastery in Shan Kaya near the Palmatis Fortress was abandoned in the Early Middle Ages, i.e. during the barbarian invasions of Avars and Slavs in the 6th-7th century, but was restored after the First Bulgarian Empire adopted Christianity in 865 AD (i.e. in the 9th-10th century). It is has been hypothesized that in the Late Middle Ages, i.e. during the Second Bulgarian Empire, the monks from Shan Kaya might have relocated to other rock monasteries in Northeast Bulgaria such as those along the Rusenski Lom River.
The main gallery of the rock monastery near Palmatis, which is 64 meters long, and connects numerous niches, has been preserved.
Few details are known about the Palmatis Fortress since before the summer of 2016, it had only been explored with geophysical surveying, without archaeological excavations.
Today the small town of Onogur is populated by descendants of Tatars from the Crimean Peninsula who were settled in Northeast Bulgaria by Ottoman Turkey after the Russian-Turkish Wars of 1806-1812, 1828-1829, and 1853-1856 (i.e. the Crimean War), while hundreds of thousands of ethnic Bulgarians were fleeing the atrocities of the regular and irregular Ottoman troops for the then southwest of the Russian Empire. (Today the descendants of these refugees form the communities of the historic Bulgarian minorities in Ukraine and Moldova known as the Bessarabia Bulgarians and the Taurica (Crimean) Bulgarians).