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The citadel rose to the peak of its importance in the period during and after the Crusader presence in the Near East. Zengid ruler Imad ad-Din Zengi, followed by his son Nur ad-Din (ruled 1147–1174) successfully unified Aleppo and Damascus and held back the Crusaders from their repeated assaults on the cities. Several famous crusaders were imprisoned in the citadel, among them Count of Edessa, Joscelin II, who died there, Raynald of Châtillon, and the King of Jerusalem, Baldwin II, who was held for two years. In addition to his many works in both Aleppo and Damascus, Nur ad-Din rebuilt the Aleppo city walls and fortified the citadel. Arab sources report that he also made several other improvements, such as a high, brick-walled entrance ramp, a palace, and a racecourse likely covered with grass. Nur ad-Din additionally restored or rebuilt the two mosque and donated an elaborate wooden mihrab (prayer niche) to the Mosque of Abraham. The mihrab disappeared during the French Mandate.