Pir Huseyn Khanqah (fortress) built
1300 CE.
Shown on the map at 40.154°, 49.008°.
The Pir Huseyn Khanqah and Mausoleum lies along the left bank of Pirsaat River (Pirsaatçay), 126 kilometers to the southwest of Baku. The inscription plaque over the portal, read by V. Kratchkovskaya in 1952, announces that the khanqah (dervish monastery) was built by Sharaf al-Dawla wal-din Hasan during the reign of the Shirvanshah Afridhun Abul-Muzaffar Fariburz (Fariburz III, 1225–1255). The title gives a later date: "Here lies the sheikh, imam, mystic...Al-Husain, son of 'Ali, known as Pir Husain Rawanan...His tomb was rebuilt by 'Umar, son of Muhammad al-Shirzadi of Qazvin and completed in the year of 684 [1280 B.C.E.]." It is likely that the tomb of Pir Husayn bin Ali, an Azeri sheikh of the Qalandari sect who lived in the 11th century, existed on this site before a formal khanqah was built around it in the 13th century. Built out of cut-stone, the roughly rectangular complex was centered on an open courtyard fortified with ramparts, similar to a ribat. The crenellated rampart walls were buttressed with round bastions at the corners and semicircular bastions at the middle of the south, east and west walls.
Text from the Wikipedia article Pir Huseyn Khanqah, licensed CC BY-SA 4.0.