The Rashidun Caliphate defeats the Sasanian Empire at the Battle of al-Qādisiyyah in Iraq.

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The Rashidun Caliphate was the early Islamic polity led by the first four successive caliphs (lit. "successors"): Abu Bakr, Umar, Uthman, and Ali, collectively known as the Rashidun, or "Rightly Guided" caliphs. These early caliphs led the Muslim community (Ummah) from the death of the Islamic…