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→Implications of the Battle
Typically, the fall of one empire, in this case the Sasanian, and rise of another, the Islamic Empire, which became the Umayyad and later Abbasid Empire, as well as spawning other states, would not be that different from other succession of empires that was typical in the 1st millennium CE. However, the battle at Qadisiyyah and subsequent conquests it enabled allowed many social changes to occur that proved to spread to many regions.
First, the fall of the Sasanians, which became more inevitable after the battle, meant that the once widespread Zoroastrian religion began to fade and many adherents eventually converted to Islam (Figure 1). In effect, it allowed one religion to be mostly replaced by another. Although this process occurred over a long period, the events at Qadisiyyah paved the way for this to accelerate. <ref>For more on the replacement of the Zoroastrian faith in many places, see: Rose, Jenny. 2011. <i>Zoroastrianism: An Introduction.</i> Introductions to Religion. London: I. B. Tauris.</ref>
Second, the defeat of the Persians paved the way for major Arab migrations to Iraq and more fertile regions of the Middle East. Although Arabs were present before in many towns and cities in the Middle East, this now meant the Arabic language started becoming more prominent as migrants came to different regions. With the use of Arabic in Islam, it cemented the spread of this new common language to be widespread across not only the Middle East but it soon spread to Iran and west to North Africa.
