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Question: Assess the main achievements of the first four caliphs (632 to 661 AD). How powerful and united was the Arab Empire at the death of Ali? {1996} Abu Bakr,, was the father-in-law of Mohammed and was the first converts to Islam. After the demise of Mohamm ....

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.... on entering Mecca, to reconvert these tribes. He succeeded and the Arabs members, who were now convinced of the power of the Medina, expanded his Moslem army. Khalid also launched a surprise invasion eastward across the Euphrates and surrounded the provincial capital of Hira. Being a Ummayad, Abu Bakr had political and military powers to complement his religious authority and at the start of Abu Bakr's reign, the Arabs were able to conquer the whole of the Middle East. In less than a century, the mobile Moslems were able to successfully defeat the Byzantine and in the entire fertile cresent. At about 634, when Khalid was marching into Damascu ....