The developments and events of early Islamic history in the conquered Islamic regions were inspired and influenced by influential figures of this era. Each of the prominent men and conquerors during the Islamic conquests had a social and tribal origin that influenced their behavior and actions in the Islamic era. One of these Arab Muslim conquerors who conquered many lands in Iran during the Caliphate and Umayyad periods was Rabi' ibn Ziyad‌ al-Harithi. Rabi's behavior and performance during the Islamic conquest of Iran is a very good example for explaining the nature of the performance of the Arab conquerors. The main question is what was Rabi 'al-Harithi's political and military performance and how she dealt with the Iranians during the conquests? It seems that, in many cases, the behavior and actions of conquerors like Rabi' were a contradictory mixture of pre-Islamic Arab traditions and morals and Islamic teachings and models. Therefore, during the period when Rabi was influenced by Pre-Islamic and Arab tribal traditions, he had violent behavior such as brutal killing, cruelty, humiliation, enslavement of captives, women and children. But when she got acquainted with Islamic teachings and traditions through Hasan Basri, she showed a more benevolent and peaceful attitude towards Iranians.