It is said that the city of Qom existed in the pre-Islamic ages, whereas, some believe that the same belongs to the post Islamic times.
'Kom' was the name of the ancient rampart of the city of Qom, thus, the Arabs called it Qom.
During the Arab conquests in Iran, Qom was a district of Esfahan and thereby was captured along with the same. In the year 23-24 AH., Abu Moosa Ashari, dispatched a part of the forces under his command to Qom.
It was during the reign of Caliph Omar II, that Qom was captured by the Moslems, and was turned into a city due to migration of the Ashari tribe from Kufeh.
Conflicts arose between the new arrivals (Arabs) and the former residents of the area being the Zoroastrians.
Finally the invaders gained a strong hold. From the early Islamic period, the Alavians flocked to Qom so as to remain free of pursuit from the dominating Abbasside and Omavi rulers.