The Nizari Ismaili garrison of Gerdkuh, Persia surrender after 17 years to the Mongols.
Nizari Ismaili state
The Nizari state was a Nizari Isma'ili Shia state founded by Hassan-i Sabbah after he took control of the Alamut Castle in 1090 AD, which marked the beginning of an era of Ismailism known as the "Alamut period". Their people were also known as the Assassins or Hashashins.
Gerdkuh
Gerdkuh was a castle of the Nizari Isma'ili state located near Damghan in the region of Qumis.
Mongol campaign against the Nizaris
The Mongol campaign against the Nizaris of the Alamut period began in 1253 after the Mongol invasion of the Khwarazmian Empire and a series of Nizari–Mongol conflicts. The campaign was ordered by the Great Khan Möngke and was led by his brother, Hülegü. The campaign against the Nizaris and later the Abbasid Caliphate was intended to establish a new khanate in the region—the Ilkhanate.
December 15
December 15 is the 349th day of the year in the Gregorian calendar; 16 days remain until the end of the year.