World Timeline

AD 802: Prince Jayavarman declares the Khmer Empire (modern-day Cambodia) independent, and establishes the kingdom of Angkor. He is reconsecrated as a world ruler (chakravartin), or god-king (devaraja), under Hindu rites.
 
AD 803: St. Peter Stiftskulinarium, possibly Central Europe's oldest restaurant, is founded in Salzburg, Austria.
 
AD 808: Cadell ap Brochfael, king of Powys (modern Wales), dies after a 35-year reign, and is succeeded by his son Cyngen ap Cadell.
 
AD 809: Emperor Heizei becomes ill, and abdicates the throne in favor of his brother Saga, who is installed as the 52nd emperor of Japan.
 
AD 810: The Chinese government takes over the issuing of paper bank drafts, the ancestor of paper money.
 
AD 811: Byzantine–Bulgarian War: Emperor Nikephoros I organises a new campaign against the Bulgarian Empire, gathering an expeditionary force (most of the Roman army) from all parts of the empire. He is accompanied by high-ranking officials and aristocrats, including his son Stauracius and brother-in-law Michael I Rangabe (both later emperors temporarily). Krum, ruler (khan) of Bulgaria, sends envoys to sue for peace. Nikephoros refuses to accept the terms and marches through the Balkan passes towards Pliska, the Bulgarian capital.
 
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AD 814: 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.
 
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AD 815: Sihyaj K'in Ich’aak II becomes the new ruler of the Mayan city state of Machaquila in Guatemala after the death of Ochk'in Kaloomte' Aj Ho' Baak, and reigns until early 824.
 
AD 820: Emperor Xian Zong dies from poisoning (due to medicines), after a 14-year reign. He is succeeded by his son Mu Zong, as ruler of the Tang dynasty.
 
AD 821: Duke Borna of Croatia dies after an 11-year reign, as vassal of the Frankish Empire. He is succeeded by his nephew, Vladislav. Emperor Louis I recognizes him as prince of Dalmatia and Liburnia, at the Council of Aachen.
 
AD 822: King Ceolwulf I of Mercia invades Powys (Wales), but is beaten back by King Cyngen. However, Ceolwulf does destroy the fortress of Deganwy, and later takes the kingdom under his control (approximate date).
 
AD 823: Emperor Saga abdicates the throne, after a 10-year reign. He is succeeded by his brother Junna, as the 53rd emperor of Japan.
 
AD 824: February 29 – Prince Li Zhan, 14 years old, is enthroned as the Emperor Jingzong of China, four days after the death of his father, Emperor Muzong.
 
AD 827: Emperor Jing Zong is assassinated by a group of conspirators. He is succeeded by his brother Wen Zong, as ruler of the Tang Dynasty.
 
AD 829: Emperor Michael II dies after an 8-year reign in Constantinople, and is succeeded by his 16-year-old son Theophilos, as sole emperor of the Byzantine Empire.
 
AD 830: About 830 an Arabian dhow sinks on its journey from China to Arabia near the Indonesian island of Belitung, carrying some 60,000 trade items, the largest collection of Tang dynasty artifacts outside of China (Belitung shipwreck).
 
AD 831: The last major revolt by Copts against Abbasid rule in Egypt took place in the Bashmur region in the north of the Nile Delta.
 
AD 832: Emperor Theophilos promulgates a new edict against the usage of icons in the Byzantine Empire. He establishes strict punishments against idolators, and persecutes violators.
 
AD 839: The Vikings invaded Scotland and attained victory over local residnets in the "Battle of 839", marking the beginning of extinction of the Picts people
 
AD 840: February 10 – Chinese Tang dynasty Emperor Wenzong (Li Ang) dies after a 13-year reign. Through the intervention of his powerful palace eunuchs, he is succeeded by his brother Wuzong.
 
AD 841: The climax of Carolingian Civil War, the Battle of Fontenoy-en-Puisaye, took place. At the cost of 30 thousand lives, Charles and Louis defeated Emperor Lothar.
 
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