In the 7th century, the world saw the rise of one of the most important religious and political forces in history: Islam. Springing forth from the Arabian Peninsula, within a matter of months, the Islamic Caliphate had become one of the largest empires on Earth. Much of that growth was due to one man. He wasn’t a religious leader, and he wasn’t the head of the empire. He was one of the greatest military leaders in history.
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