In the year 577/1181–2, in a letter to the Caliph in Baghdad explaining his activities in Syria, Saladin writes that he is engaged in a struggle for Islam against a three-fold enemy—the infidel Frankish invader, the heretical and murderous Assassins, and the treacherous Zangid rulers of Mosul, whom he accuses of intelligence and even alliance with both Franks and Assassins.
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Bernard L. Lewis (1953) studied this question.
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