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Centuries: 8th century - 9th century - 10th century Decades: 790s 800s 810s 820s 830s - 840s - 850s 860s 870s 880s 890s Years: 840 841 842 843 844 - 845 - 846 847 848 849 850 Events March 28 - Paris is sacked by Viking raiders, probably under Ragnar Lodbrok, who collect a huge ransom in exchange for leaving. Births Deaths Michael I, Byzantine Emperor (811-814) al-Khwarizmi, mathematician (approximate date)
Centuries: 8th century - 9th century - 10th century
Decades: 790s 800s 810s 820s 830s - 840s - 850s 860s 870s 880s 890s
Years: 840 841 842 843 844 - 845 - 846 847 848 849 850
Births
Deaths