Hasankeyf Castle

For more than twelve thousand years, a settlement perched above the upper Tigris River in southeastern Anatolia has stood as a witness to the entire span of human civilization. Hasankeyf, in the modern Turkish province of Batman, is one of the oldest continuously inhabited places on earth, and the castle that crowns its limestone cliff has anchored the town's identity through the rule of empires whose names span the long centuries between the Roman frontier and the Ottoman heartland. Today, in one of the most poignant chapters of recent heritage history, much of historic Hasankeyf lies submerged beneath the reservoir of the Ilısu Dam, but the castle itself, set high above the rising waters, endures as a magnificent reminder of all that this place once held.

Hasankeyf Castle, known in Arabic as Hisn Kayfa or "Rock Fortress," sits roughly a hundred metres above the Tigris on a sheer limestone outcrop riddled with thousands of cave dwellings cut by human hands across the millennia. Its strategic position commanded both the river crossing and the long trade roads between Diyarbakır and Mosul, making it one of the most coveted defensive sites in upper Mesopotamia.

From Roman Outpost to Byzantine BishopricAlthough evidence of human occupation around Hasankeyf reaches back into the Neolithic period, the first stone fortifications on the rock were built by the Romans in the fourth century CE, during the reign of Emperor Constantius II, son of Constantine the Great. The empire was then locked in a long struggle with the Sasanian Persians, and Hasankeyf served as a frontier garrison guarding the eastern approaches to Anatolia. After the formal division of the Roman Empire, the Byzantines retained the castle and elevated it to greater prestige: by the Council of Chalcedon in 451 CE, Hasankeyf had become the seat of a Syriac Christian bishopric, a status that it retained for almost three centuries.

In 638, during the rapid Arab conquests that followed the death of the Prophet Muhammad, the castle fell to Iyad ibn Ghanm, a commander serving under the great general Khalid ibn al-Walid. From that moment, Hasankeyf passed through the hands of a succession of Islamic dynasties: the Rashidun and Umayyad caliphates, the Abbasids, the local Hamdanids, and finally the Marwanids, none of whom left a particularly notable architectural mark.

The Artuqid Golden AgeThe fortunes of Hasankeyf changed dramatically after the Battle of Manzikert in 1071, the watershed Seljuk victory that opened Anatolia to Turkic settlement. In 1102, the Turkmen warrior Sökmen Bey, a commander under the Great Seljuks, seized the castle and made it the capital of a new Artuqid emirate that would govern the region for the next 130 years. Under the Artuqids, Hasankeyf entered its golden age. The castle was rebuilt and expanded into a great fortified complex of palaces, barracks, royal quarters, and twin water passages descending the cliff face to the Tigris below, including a celebrated secret tunnel still partially traceable today.

The most famous of all Artuqid commissions at Hasankeyf was not the castle itself but the great bridge thrown across the Tigris in the twelfth century, an arch of cut stone considered the largest medieval bridge in the world at the time of its construction. Its piers, all that remain today, recall the ambition of the dynasty whose engineers also produced one of the most extraordinary intellects of the Islamic Middle Ages: Badi al-Zaman al-Jazari, the polymath whose treatise on automata, completed at Hasankeyf in 1206, anticipated by several centuries the principles of modern robotics. Al-Jazari's account of the bronze door he designed for the Artuqid palace, decorated with serpents and lions, remains one of the most evocative descriptions of medieval Hasankeyf to survive.

Ayyubids, Akkoyunlu, and OttomansIn 1232, the Ayyubid sultan al-Malik al-Kamil, nephew of the famous Saladin, captured Hasankeyf. Under Ayyubid rule the castle continued to be expanded, and the surrounding lower town gained the religious and civic monuments that would become its hallmark: the Ulu Mosque, the El-Rizk Mosque with its slender brick minaret carved with the ninety-nine names of God, the small cube-shaped tomb of Imam Abdullah, and a network of madrasas and bathhouses. When the Mongols under Hulagu Khan swept across the region in 1260, the inhabitants of Hasankeyf retreated into the citadel and the labyrinth of caves, surviving the catastrophe that devastated so many other Mesopotamian cities.

The fifteenth century saw the rise of the Akkoyunlu, the Turkmen White Sheep confederation, whose ruler Uzun Hasan added the most celebrated building of late medieval Hasankeyf: the cylindrical Zeynel Bey Mausoleum, a tomb of glazed turquoise and dark blue brick built for Hasan's son after his death in battle in 1473. The mausoleum represents a unique example of Central Asian architectural decoration in Anatolia.

When the Ottoman Empire absorbed the region in the early sixteenth century, Hasankeyf's importance gradually faded. Without the frontier conditions that had previously made it strategically vital, the town slipped into a quiet provincial existence punctuated only by a small Ottoman mint and a hammam. By the modern era, Hasankeyf had become a sleepy district of Batman Province, more notable for its archaeological richness than its political weight.

The Ilısu Dam and the Loss of the Lower TownFor decades, the very existence of historic Hasankeyf was threatened by one of Turkey's largest infrastructure projects, the Ilısu Dam on the Tigris, designed to generate hydroelectric power and irrigate downstream agriculture. Despite international protests by UNESCO, Europa Nostra, and the World Monuments Fund, which placed Hasankeyf on its watch list of the world's most endangered heritage sites, the reservoir began filling in 2019 and 2020, submerging much of the lower town and an estimated three hundred archaeological monuments.

A small number of the most important monuments, including the Zeynel Bey Mausoleum and the Imam Abdullah Tomb, were laboriously dismantled, transported, and reassembled in a new Hasankeyf Cultural Park on higher ground above the reservoir. The castle itself, perched far above the water level, was not affected by the flooding and remains accessible to visitors, although the surrounding landscape has been transformed beyond recognition.

Visiting Hasankeyf TodayModern visitors typically reach Hasankeyf as a day trip from Mardin, Diyarbakır, or Batman, three of the great historical cities of southeastern Anatolia. The castle is approached either by car along newly built mountain roads or by a short boat ride across the reservoir from the cultural park. Inside the citadel, the remains of the Great Palace, the seven gates of the fortifications (three of them once hidden), the rock-cut chambers of the early Byzantine and Islamic periods, and the panoramic views over the new Tigris reservoir combine into one of the most haunting experiences offered by any heritage site in Turkey.

For travellers drawn to history at the very edge of disappearance, to the deep stratigraphies of Mesopotamian civilization, and to the unforgettable beauty of a stone fortress that has watched empires rise and fall for more than sixteen centuries, Hasankeyf Castle is more than a destination. It is a meditation on memory itself.