Hassan-i-Sabbah (ハサン・サッバーハ, Hasan Sabbāha?), also known as the "Old Man of the Mountain" (山の翁, Yama no Okina?), is the pseudonym shared by the nineteen leaders of the Hashshashin, a medieval Islamic sect based in Persia. At some point, one of the nineteen Hassan-i-Sabbah joined forces with Richard I and Saladin to fight together against a Dead Apostle during the Third Crusade. All nineteen are currently wraiths considered Heroic Spirit Candidates that have yet to properly ascend to the Throne of Heroes. When summoned as Servants, they are always the Assassin class, and sometimes the only possible candidates for the class entirely. The name of the sect is the etymological root of the word "assassin;" and the class name itself thus acts as the catalyst to summon the members of the organizati