Fall of Masyaf

The Mongol siege of Masyaf was an event during to 13th century when grandson of Genghis Khan, Hulagu Khan led an assault on the fortress of Masyaf in an attempt to annihilate the Assassin Order for their part in his grandfather's death in 1227.

During 1257 Grand Master of the Assassin Order, Altaïr Ibn-La'Ahad, now 92 years-old, was interviewed by Niccolò Polo and his brother Maffeo Polo to document the stories of his life and the Order. Eventually the bothers needed to make their departure as the Mongolians attacked unexpectly and besieged the village. Though most of the Assassins left the fortress to increase their numbers throughout the world, enough remained to hold off the Mongolians temporaily. Passing on his life's work: Codex and Seals, Altaïr instructed the brothers to hide the seals through the city of Constantinople.

Before escaping, Niccolò told to Grand Master to "take care of [him]self", to which he replied he would "consider it".