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"The 810s decade ran from January 1, 810, to December 31, 819. Significant people * Charlemagne * Louis the Pious * Leo V of Byzantium * Al-Ma'mun, Abbasid khalif References "
"The 820s decade ran from January 1, 820, to December 31, 829. Significant people * Louis the Pious * Egbert of Wessex * Michael II * Thomas the Slav * Omurtag of Bulgaria * Al-Ma'mun References "
"The 830s decade ran from January 1, 830, to December 31, 839. Significant people * Louis the Pious * Egbert of Wessex * Ansgar * Wiglaf of Mercia * Turgesius References "