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Fall of the Western Roman empire
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Romulus Augustulus was deposed by Odoacer. He was the last Western Roman Emperor.
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Charlemagne was crowned as Emperor by Pope Leo III on 25 December 800, but his dominions were divided between his heirs, with the eastern portions ultimately reunited under Otto I. After Pope John XII asked Otto for military assistance, Otto secured a papal coronation for what would become the Holy Roman Empire.
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The Norman conquest of England was the 11th century invasion and occupation of England by an army of Norman, Breton, and French soldiers led by Duke William II of Normandy, later styled as William the Conqueror
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Vikings attack Europe and Ireland, seriously threatning Europe
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During the First Crusade, Christian knights from Europe capture Jerusalem after seven weeks of siege and begin massacring the city's Muslim and Jewish population.
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Mongols invade and take over Eastern Europe and China
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It took place in 1271–1272. Louis IX of France's failure to capture Tunis in the Eighth Crusade led Henry III of England's son Edward to sail to Acre in what is known as the Ninth Crusade.