840s
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849
Events
- 843 : The grandchildren of Charlemagne ( Ludwig the German , Karl der Kahle and Lothar I ) divide his empire in the Treaty of Verdun .
- 845 : The Vikings plunder Paris and destroy Hammaburg ( Hamburg ); Bremen then becomes the seat of the Archdiocese of Hamburg .
- 847 : Leo IV fortifies the city of Leo (the Vatican quarter ).
- 849 : Battle of Ostia .
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