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The faith was preached by Hamza ibn Ali ibn Ahmad, an Ismaili mystic and scholar from Zozan, Khorasan, in the Samanid Empire. He came to Fatimid Egypt in 1014 or 1016 and assembled a group of scholars and leaders from across the world to establish the Unitarian movement. The order's meetings were held in the Raydan Mosque, near the Al-Hakim Mosque.