What empire was defeated by the Muslim army at the battle of Nihawand and ended in 642?

Name: What empire was defeated by the Muslim army at the battle of Nihawand and ended in 642?
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The battle of Nihawand was fought between the Muslim Arab forces under Sa`d ibn Abi Waqqas and the Sassanid empire in 642. The Muslim army emerged victorious, inflicting a decisive defeat on the Sassanid forces, ending the Sassanid Empire and ushering in Muslim control over Persia.

What Empire Was Defeated by the Muslim Army at the Battle