Some written works attribute Qom age to a legendary king named "tahmureth" and believe that before Islam Qom was an important and larg city. In 23 A.H "Abu musa Ash'ari", the Muslim commander, conquered this city in Harun al-Rashid's time in 189 A.H Qom separated from Isfahan.
The most crucial events that caused the development of this city were the immigration of many holy prophets' descendants and the dissemination of shi'ite thoughts. Imam Reza and his sister's (P.b.u.H) arrival at this city In 200 and 201 A.H respectively changed Qom to one of the greatest Shiite centers in the world.
Moreover, the gradual substitution of kufe seminary with Qom seminary during the second A.D year made a sciences and theologies center out of Qom. When hadhrat Ma'suma passed away in 201. She was buried in a famous garden named "Babelan" and this caused people's residing in this place and taking spiritual advantages from her tomb.
From that time on people moved to west regions of the city. This holy shrine is the most important cause of Qom development. The biggest damages to this city and its people were caused by Mongols invasion in 621. The historical hill of "qoli dervish" was a residential comelex where Mongols destroyed it. Finally after the nineth century the black clouds left the sky of this city and the people were inspired by a new spirit and the sun of life started shining upon this land and its people.