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During al-Musta‘li's reign, the First Crusade (1099) established the Kingdom of Jerusalem, the County of Tripoli and the Principality of Antioch, which further reduced Fatimid power in Syria and Palestine.
Shortly afterwards, Constantine and Prince Bohemond III lead their troops together against Nur ad-Din Zangi's armies that had laid siege to Krak des Chevaliers, a fortress in the County of Tripoli.