Gerdkuh
Encyclopedia
Gerdkuh, one of the main Ismaili
Ismaili
' is a branch of Shia Islam. It is the second largest branch of Shia Islam, after the Twelvers...

's Hashshashin
Hashshashin
The Assassins were an order of Nizari Ismailis, particularly those of Persia that existed from around 1092 to 1265...

 fortress which used by Hassan Sabah
Hassan-i-Sabah
Hassan-i Sabbāh was a Persian Nizārī Shi'a Ismā'īlī Muslim missionary who converted a community in the late 11th century in the heart of the Alborz Mountains of northern Iran. The place was called Alamut and was attributed to an ancient king of Daylam...

. It was conquered by Hulagu Khan finally. Due to circular shape of mountain peak, it was name Gerdkuh, Gerd for circular (round) and Kuh for mountain. This shape made it very difficult to access by invaders.
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