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|803 by topic|
|Ab urbe condita||1556|
|Balinese saka calendar||724–725|
|Chinese calendar||壬午年 (Water Horse)|
3499 or 3439
— to —
癸未年 (Water Goat)
3500 or 3440
|- Vikram Samvat||859–860|
|- Shaka Samvat||724–725|
|- Kali Yuga||3903–3904|
|Japanese calendar||Enryaku 22|
|Minguo calendar||1109 before ROC|
|Seleucid era||1114/1115 AG|
|Thai solar calendar||1345–1346|
929 or 548 or −224
— to —
930 or 549 or −223
- Emperors Nikephoros I and Charlemagne settle their imperial boundaries in the Adriatic Sea, and sign the Pax Nicephori ("Peace of Nikephoros"). The Byzantines retain control of the coastal cities and islands in Dalmatian Croatia, while Frankish rule is accepted over Istria and the Dalmatian hinterland. Venice is recognized as independent by the Byzantine Empire.
- Summer – Bardanes Tourkos, Byzantine general (strategos), is proclaimed emperor by the troops of the Anatolic, Opsikion, Thracian and Bucellarian themes. The 'rebel' army marches to Chrysopolis, a suburb of Constantinople. After the defection of two of his trusted aids, future emperors Leo the Armenian and Michael the Amorian, Bardanes negotiates peace.
- May – Krum, ruler (khan) of the Bulgarian Empire, begins his territorial expansion and raids the Byzantine northern frontier. He leads his warriors — mostly Bulgars, Slavs, Thracians and Macedonians — across the Carpathian Mountains, over the Danube River, and throughout Transylvania, Thrace, and Macedonia.
- Stiftskeller St. Peter, possibly Central Europe's oldest restaurant, is founded in Salzburg, Austria.
- Downfall of the Barmakids: Caliph Harun al-Rashid has his friend Ja'far ibn Yahya beheaded, possibly for having an affair with his sister Abassa. The surviving members of the influential Barmakid family are imprisoned on the orders of Harun, and their property is confiscated.
- October 12 – The Synod of Clofesho (possibly Brixworth) is held, at which the Archbishopric of Lichfield is demoted to an ordinary bishopric, with papal permission obtained by King Coenwulf of Mercia.
- Du Mu, Chinese poet and official (d. 852)
- Emma of Altdorf, Frankish queen and wife of King Louis the German of East Francia (died 876)
- Ibn 'Abd al-Hakam, Muslim historian (d. 871)
- Liu Congjian, Chinese governor (d. 843)
- May 25 – Higbald, bishop of Lindisfarne
- August 9 – Irene of Athens, Byzantine empress
- Ja'far ibn Yahya, Persian vizier (b. 767)
- Kardam, ruler (khan) of Bulgaria (or 802)
- Florin Curta: Southeastern Europe in the Middle Ages, 500-1250, p. 135.
- MYTravelGuide Stifskeller St Peter.