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Muhammad selected Hurmuz as a chief dai of the mission, and then had made his footing at the fortified city of Nihawand, where he stayed with the governor, Mansur bin Jowshan, who had close ties with Ishaq bin al-Abbas. He allotted the Imam a piece of land in the district of Sarha, where he led a peaceful living.
Nihawand was a town, lying about forty miles south of old province of Hamdan. It lies on the southern road, which coming from Kirmanshah, leads into Ispahan. The district of Nihawand was formerly called Mah-Bahrajan or Maha-Dinar. Among the products of Nihawand the Arab historians mention willow-wood which was used for polo-sticks (sawalija), aromatic reeds (kasbat al-dharira) to be used for hanut (a kind of perfume).