814

By place

Byzantine Empire

• April 13 - Byzantine–Bulgarian wars: Over the winter Krum, ruler of the Bulgarian Empire, assembled a huge army, for a campaign against the Byzantine Empire. But before he sets out for a major attack on Constantinople he dies of a stroke. Krum is succeeded by his son Omurtag.

  Europe

• January 28 - Charlemagne dies of pleurisy in Aachen, after an almost 14-year reign as the first Roman Emperor of Frankish origin. He is embalmed and buried in Aachen Cathedral. Charlemagne is succeeded by his son Louis the Pious, as king of the Frankish Empire.
• Louis I establishes himself at the imperial court of Aachen. He appoints Benedict of Aniane as his chief advisor on religious matters, and makes him abbot of Kornelimünster Abbey, which is founded by him.

  Japan

• Shinsen Shōjiroku, a record of the genealogy of the ancient Japanese noble families, is completed during the reign of Emperor Saga.

  By topic

Religion

• : Conflict erupts between Emperor Leo V and Patriarch Nikephoros, on the subject of iconoclasm. The latter is excommunicated.