Al-Hakim al-Munajjim was sent from Alamut Castle to Syria in the 12th century, probably accompanied with a number of subordinate da'is.
He appeared in Aleppo in northern Syria, which was a suitable place for him to begin his career, as it had a prominent Shi'a population, and was close to Jabal al-Summaq, which was already influenced by Isma'ilism.
Al-Hakim al-Munajjim managed to gain the favor of Ridwan, and they openly allied with each other; the Nizaris established their Mission House (dar al-dawah) in Aleppo and openly began their religious activities.
Duqaq, the amir of Damascus, then quickly captured Homs, preventing its fall to the Franks.
He was succeeded as the Nizari da'i of Syria by another Persian, Abu Tahir al-Sa'igh.