Haggard, H. Rider - The Brethren (Fiction)

Action-packed romance playing during the Crusades: A knight once was captured in Palestine by legendary and generous Saladdin, fell in love with his sister and escaped with her to his homestead in England, where they have a daughter. Many years later, Saladdin dreams of his niece saving many lives, which moves him to to bring her back to Palestine, by force, if need be... But he hasn't counted with her two cousins, who both love her and one of whom is to be married by Saladdin's niece -- but which one, if ever?
Featuring the Hashasheen (aka "Assassins" -- a Shi'ite order and mortal enemies of Sunnite lord Saladdin), the Templars, etc. etc., and plenty packed action that tests both faith and honour of the heroes and their beautiful cousin. -- Haggard shows he can write not only brilliant African yarn.