The ancient city of Ghom the revival of which, after its destruction by Alexander the Macedonian, is attributed to the Sasanid king, Ghobad, was conquered by the Arabs in 23 A.H. Large-scale migration to the city by the Shi'ites in the late 3rd century (A.H.), transformed Ghom into a Shi'ah-inhabited city causing its boom and growth. This article, while briefly referring to Ghom's geographical situation and its historical geography in ancient times as well as early Muslim centuries, takes up the conquest of the city by the Muslim Arabs. The article also deals with the political, religious and social consequenes of the settlement of Shi'ite Arab tribes in Ghom in the 1st and 2nd centuries A.H.
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