Hülegü Khan

Hülegü Khan (c. 1218 – 8 February 1265, English: Hulagu Khan), was a Mongol ruler who conquered much of southwest Asia. He was the grandson of Genghis Khan and a brother of Kublai Khan.

In 1256, Mongol forces under Hülegü's command attacked various Assassin fortresses throughout the Levant, in vengeance of Genghis Khan's murder at the hands of the Levantine Assassin Darim Ibn-La'Ahad and the Mongolian Assassin Qulan Gal, as well as an attempt on his own life.

In August 1257, Hülegü led a siege on the Levantine Assassins' headquarters in Masyaf, hoping to ultimately destroy the Assassins. However, Masyaf was abandoned by the Assassin Order, and the remaining Assassins fled to different locations around the globe before the siege ended.

Reference

• Assassin's Creed Encyclopedia