Which empire did Umar's caliphate conquer in less than two years?
Byzantine Empire
Sasanian Empire
Ghaznavid Empire
Umayyad Empire
Answer
Under Umar's rule, the caliphate conquered the Sasanian Empire in less than two years (642-644). This rapid expansion was unprecedented in the history of the caliphate.
Unraveling the Legacy of Umar: The Mighty 2nd Rashidun Caliph (634-644)
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