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  For the fall of Rome, it was the Huns invading from the east that caused the domino effect, they invaded the Goths, who then invaded the the Roman Empire.
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  the white Huns invade India and destroy the Indian Gupta in 470
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  the Muslim community spreads through the middle east through conquest
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  the Normans conquered England at the battle of Hastings. they then took the hole of England and then England was theirs.
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  First Crusade, the successful siege saw the Crusaders take Jerusalem from the Fatimid Caliphate and laid the foundations for the Kingdom of Jerusalem.
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  Zhu Yuanzhang officially proclaimed himself emperor in Yingtian and founded the Ming Dynasty
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  (802-1431) the Khmer empire was a powerful state in south Asia, formed by people that have the same name. at its peak the empire covered much of what today is known as Cambodia.