The Sasanian Empire was overthrown by Arab-Muslim armies during the Islamic conquest of Iran in the 7th century. The Arab-Muslim forces, led by Caliph Umar, won a decisive victory against the Sasanian army at the Battle of al-Qādisiyyah in 637 CE, which marked the beginning of the fall of the Sasanian Empire. Over the next several years, the Arab-Muslim armies continued to conquer territories controlled by the Sasanians, ultimately leading to the collapse of the empire.
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