Alamut Castle
Remains of the Alamut Castle in Qazvin, Iran
Location within Iran
General information
Type	Castle
Architectural style	Iranian
Location	Alamut region, Qazvin Province of Iran (Historically also: Tabaristan), Moallem Kalayeh, Iran
Coordinates	36°26′41″N 50°35′10″E / 36.44472°N 50.58611°E / 36.44472; 50.58611
Completed	865
Destroyed	1256

Alamut (Persian: الموت, lit. 'Eagle's Nest') is a ruined mountain fortress located in the Alamut region in the South Caspian, near the village of Gazor Khan in Qazvin province in Iran, approximately 200 km (130 mi) from present-day Tehran.^{[1]: 22–23}

In 1090 AD, the Alamut Castle, a mountain fortress in present-day Iran, came into the possession of Hassan-i Sabbah, a champion of the Nizari Ismaili cause. Until 1256, Alamut functioned as the headquarters of the Nizari Ismaili state, which included a series of strategic strongholds scattered throughout Persia and Syria, with each stronghold being surrounded by swathes of hostile territory.

Alamut, which is the most famous of these strongholds, was thought impregnable to any military attack and was fabled for its heavenly gardens, library, and laboratories where philosophers, scientists, and theologians could debate in intellectual freedom.^[2]

The stronghold survived adversaries including the Seljuk and Khwarazmian empires. In 1256, Rukn al-Din Khurshah surrendered the fortress to the invading Mongols, who dismantled it and destroyed its famous library holdings. Though commonly assumed that the Mongol conquest obliterated the Nizari Ismailis presence at Alamut, the fortress was recaptured in 1275 by Nizari forces, demonstrating that while the destruction and damage to the Ismailis in that region was extensive, it was not the complete annihilation attempted by the Mongols. However, the castle was seized once again and fell under the rule of Hulegu Khan’s eldest son in 1282. Afterward, the castle was of only regional significance, passing through the hands of various local powers.

Today, it lies in ruins.