The role of Iranians in conquering Ctesiphon by Muslims in 16 AH

Ctesiphon was chosen as the main Sassanid podium coeval with the conquests of Islam as the main target of the spread of Islam to the East by Muslim Arabs. What made Muslims quicker and easier to conquer this megalopolis was the companionship of some Iranians with the followers of the new ritual. For example, when the Islamic Revolutionary Guards arrived in Ctesiphon, the people almost emptied the cities of Ctesiphon and did not show any resistance, and in some cases, groups of Iranians joined the Islamic Corps and the Islamic Corps in various cases, such as inviting people to Islam, as well as encouraging them to contribute to peace. It seems that the study of the historical events of this period can be deduced that along with the military presence of the Arab-Arabs, the actions of Iranians in the form of various classes of the society of the Sasanian society, such as elite (Salman Farsi), warriors (Esvarans) and peasant classes (Shirazad) is also worth considering. In this research, the how and why importance of presence of Iranians during this event is being discussed.