Handaberd, Medieval fortress in Martakert Province, Azerbaijan.

Handaberd, also called Khokhanaberd or Xanabert, is a ruined mountaintop fortress near the village of Vank, opposite the hill of Gandzasar Monastery. Half-collapsed defensive walls and the remains of various buildings survive on the summit. Inside are a square structure and three water wells 6 m deep and 3 m wide; about 30 m from the walls, a rectangular building on a large rock may be a watchtower.

The fortress was built between the 7th and 9th centuries under Arab rule in Armenia; historian Grigor Ter-Hovhannisyants attributes it to the Armenian ruler Sahl Smbatean. In the first half of the 13th century Prince Hasan Jalal I Dawla of Khachen repaired and expanded it. Kirakos Gandzaketsi records that Hasan Jalal held out there against the Mongol general Jula, then submitted to tribute; in 1246 Bora destroyed the fortress after Güyük Khan's accession. Turkic campaigns damaged it further in the 15th and 16th centuries.

Local people call the fortress Tarxan qalası, and tradition holds that it served as the summer residence of Ruzan xatun, Hasan Jalal's daughter. In the 13th century, the rulers of Khachen styled themselves 'lord of Khokhanabert' in inscriptions, including one at Keçaris Monastery.

Visitors reach the fortress via a forest trail from Knaravan Village and need sturdy footwear for the uphill walk to the entrance. The path is wooded and the climb is steep, so allow adequate time and come prepared.

Inside the walls stand the ruins of a square building and three water cisterns, each 6 metres deep and 3 metres wide. About 30 metres from the walls, on a large rock, survive the remains of a tall rectangular structure, probably a watchtower. Local tradition calls the fortress Tarkhan and says it was the summer residence of Hasan Jalal's daughter Ruzan.