Character

King Hassan

アサシン / 山の翁 / キングハサン,

Assassin (アサシン, Asashin) is an Assassin-class Servant able to be summoned by the Protagonist in the Grand Orders of Fate/Grand Order. He was Grand Assassin (グランドアサシン, Gurando Asashin) until he removed himself of his rank of "Grand" during the battle with Tiamat. Assassin's True Name is "Old Man of the Mountain" ("山の翁", Yama no Okina), the first to hold the title of Hassan-i-Sabbah, the founder of the Hashashin where he is considered to be both the first and the last "Old Man." He is given the nickname of King Hassan (キングハサン, Kingu Hasan) by Ritsuka Fujimaru, to which he takes a liking. Even so, his actual identity was unknown even to the eighteen individuals who came to inherit his titles. Proof that he in fact existed is nowhere to be found -- except in the certainty that if ever he who takes the seat of Hassan-i-Sabbah strays from his path, there shall come an executioner to part him from his head.