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This template should be removed from the article 7 November 2019.
In 1191, after learning of William's operations in Acre, Isembart came to the city intending to serve as his bodyguard. However, the Levantine Assassins, having recovered a note stating his intentions from another knight, intercepted and killed him at the city docks. Before dying, he taunted the Assassins, stating that they were already aware of Altaïr Ibn-La'Ahad's plan to assassinate William.