Why did the Sasanian empire fall?
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The Sasanian Empire lasted until 651 CE when it was overthrown by the Arab Rashidun Caliphate.
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How it was overthrown?
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The fall of the Sasanian Empire was caused by a combination of internal instability, weakened by wars and conflicts with the Byzantine Empire and the loss of their traditional territories, as well as a sudden invasion by Arab forces under the command of the Rashidun Caliphate. The Arab forces were united and had a new religion, Islam, which gave them a strong sense of purpose and motivation. The Arab-Muslim armies, led by Khalid ibn al-Walid and later by Saad ibn Abi Waqqas, were able to defeat the Sasanian army and capture the Persian capital of Ctesiphon. The fall of the Sasanian Empire marked the end of ancient Persian civilization and the beginning of Islamic rule in the region.
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