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The Indian Gupta empire was invaded and destroyed in 455 - 606
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The fall of Rome was invaded by the Huns from the east, they invaded (pushed into) the Goths, who then invaded the Roman Empire.
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In the late 620's Muhammad had already conquered much of Arabia under Muhammad's orders.
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The Norman conquest of England was in October 14 1066. William Duke of Normandy was the leader of the conquest while winning the conquest of England.