840

{| align=right cellpadding=3 id=toc style="margin-left: 15px;"\n|- \n| align="center" colspan=2 | Years:
836 837 838 839 - 840 - 841 842 843 844\n|-\n| align="center" colspan=2 | Decades:
810s 820s 830s - 840s - 850s 860s 870s\n|- \n| align="center" | Centuries:
8th century - 9th century - 10th century\n|} Events\n* After the death of Louis the Pious, his sons Lothair, Charles the Bald and Louis the German fight over the division of the empire, with Lothair succeding as Emperor.\n*Tang Wu Zong succeeds Tang Wen Zong as emperor of China.\n* Foundation of Dublin by Vikings. Births\n*Aed I of Scotland (approximate date)\n*Ethelred of Wessex (approximate date)\n*Edmund of East Anglia (approximate date) Deaths\n*June 20: Louis the Pious, king of the Franks, Emperor\n*Emperor Junna of Japan \n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n