Ustra Fortress seen from below on its rocky peak

Fortress & castleRhodopes & Southern Bulgaria

Ustra Fortress, the Medieval Stronghold of the Eastern Rhodopes

Ustra is a medieval fortress on a steep rocky peak in the Eastern Rhodopes, about 1.25 km north of the village of Ustren in Dzhebel municipality. It is among the highest and best-preserved fortifications in the mountain range, with walls that still stand 8–10 m high in places and three towers. A path through the hills leads up to it, so the visit combines a walk with a real medieval ruin.

The only gate of Ustra lay at the far end of its walls, up seven steps cut in the rock, so attackers had to pass the whole wall before reaching it. A peak in Antarctica is named after the fortress.

WhereEastern Rhodopes, on a rocky peak about 1.25 km north of the village of Ustren, Dzhebel municipality, Kardzhali Province

TypeRuined medieval hill fortress, a cultural monument of national importance

Best forHikers, history fans and photographers who like panoramic views

Getting thereAbout 10 km from Dzhebel and 30 km from Kardzhali to Ustren, then roughly an hour on foot along a path from the village

The history of Ustra Fortress

Little is known about the history of Ustra, and the fortress is best read through its stones. Archaeological data suggest that it was built in the tenth century to protect an important trade route that ran nearby. Bulgarian sources place its earliest phase in the reign of the Byzantine emperor Constantine VII Porphyrogennetos (913–959), at a time when the Rhodope passes mattered greatly to both empires.

The fortress was probably taken by the armies of the Bulgarian ruler Simeon I the Great (reigned 893–927) in the first decade of the tenth century. It is believed to be among the strongholds returned to the Byzantine Empire in 913, as part of a peace deal in which Byzantium recognised the imperial title of the Bulgarian rulers as the first tsars. The deal was short-lived: the Byzantines provoked a new war, which lasted from 913 to 927 and ended in a decisive Bulgarian victory. Even so, in the final peace treaty of 927 Ustra was most likely among the conquests handed back to the Byzantines.

The fortress is mentioned by name in the works of two thirteenth-century Byzantine chroniclers, George Akropolites and Theodore Skoutariotes. Both describe the successful campaign of 1254 by the Bulgarian emperor Michael II Asen, who set out to win back the lands in the Rhodope Mountains that had recently been lost to the Nicaean Empire. According to Akropolites, the fortresses of Ustra, Perperek, Krivus and Efraim, near Adrianople, surrendered to the Bulgarians, who were helped by a local population that was Bulgarian-speaking and glad to throw off foreign rule.

The end of Ustra is not recorded in any detailed source. It was conquered by the Ottoman Turks in the second half of the fourteenth century, and a large breach in the outer wall is thought to be a trace of the siege. The stronghold covers 1,290 square metres and is shaped like an open quadrangle, rather like the Cyrillic letter П. Its defensive wall is 113 m long and up to 2.8 m thick at the base, strengthened by three three-storey towers, whose ground floors served as water reservoirs.

The fortress was explored in 1971–1973 by the archaeologist Stamen Mihaylov and the historian Ivan Balkanski, then curator of the history museum in Kardzhali. They recovered more than a thousand objects, among them iron arrowheads, bronze and silver crosses, copper coins and clay vessels. Research in 2006 found traces of large fortification works on the ridge running north-east of the promontory. Ustra has been a cultural monument of national importance since 1968, and in 2022 the site was handed from the Ministry of Culture to Dzhebel municipality for ten years to help it promote the fortress as a tourist destination.

Curious facts about Ustra Fortress

The only entrance lay in the easternmost part of the fortress, reached by seven steps cut into the rock, and anyone attacking had to walk around the whole outer face of the wall and towers first.
The ground plan is an open quadrangle in the shape of the Cyrillic letter П, which gives the ruin a distinctive outline.
The walls of the towers were coated with a mortar plaster up to 0.2 m thick, made by mixing mortar with crushed brick and large pieces of pottery.
From the fortress you can see, far to the north-east, another important castle of the region, Monyak, and traces of a second fortress lie about 1.7 km north-east of Ustra.
More than a thousand objects came out of the excavations of the early 1970s, including iron arrowheads and bronze and silver crosses.
Ustra Peak on Livingston Island in the South Shetland Islands, Antarctica, is named after the fortress.

Tours near Ustra Fortress

Experiences in the area that you can book online with Viator:

Help the hosts: Breadmaking, Yoghurt making and Cattle Keeping

★ 3 (4 reviews) · 1 h

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Shipka Church & Monument + Buzludzha Spaceship Self-Guided

★ 5 (1 reviews) · 2 h

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Incredible Cycling along the Picturesque Shipka and Buzludja

6 h

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Buzludzha Monument Spaceship Self-Guided Experience

1 h

See details ›

Visiting Ustra Fortress: what to expect

The main path starts on the eastern edge of Ustren and passes the Ustra mountain hut, then climbs steeply to the fortress; the walk takes roughly an hour at an average pace.
An easier but less known track begins in the neighbouring village of Lebed, about 3 km north-east of the fortress.
On the peak look for the walls up to 8–10 m high, the three towers, the rock-cut steps of the entrance and the foundations of eight buildings in the southern part.
The fortress stands inside the protected natural landmark of the rock formations in the Kaleto locality; wear sturdy shoes, as the path is steep.
Check the current conditions of the path and the hut before you go, as the sources give no details on opening times or services.

Opening hours, access and conditions can change. Check before you go.

Map: where Ustra Fortress is

Photos of Ustra Fortress

Questions

What is Ustra Fortress?

Ustra is a medieval fortress in the Eastern Rhodopes in southern Bulgaria. It is among the highest and best-preserved fortifications in the range.

Where is Ustra Fortress and how do you get there?

It stands on a peak about 1.25 km north of the village of Ustren in Dzhebel municipality, Kardzhali Province. The path begins at the east end of Ustren and takes roughly an hour on foot.

How old is Ustra Fortress?

Archaeological finds suggest it was built in the tenth century to protect a trade route. It was held by the Byzantine and Bulgarian empires until the Ottoman conquest in the second half of the fourteenth century.

What can you see at Ustra Fortress?

Walls up to 8–10 m high, three towers, the rock-cut steps of the entrance and the remains of eight buildings can be seen. The towers' ground floors were water reservoirs.

Who excavated Ustra Fortress?

The archaeologist Stamen Mihaylov and the historian Ivan Balkanski explored it in 1971–1973 and recovered more than a thousand objects.

Is there an easier way up to Ustra Fortress?

An easier but less known track starts from the neighbouring village of Lebed, 3 km south-west of which the fortress stands. The main path from Ustren is steeper.