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|816 by topic|
|Ab urbe condita||1569|
|Balinese saka calendar||737–738|
|Chinese calendar||乙未年 (Wood Goat)|
3512 or 3452
— to —
丙申年 (Fire Monkey)
3513 or 3453
|- Vikram Samvat||872–873|
|- Shaka Samvat||737–738|
|- Kali Yuga||3916–3917|
|Japanese calendar||Kōnin 7|
|Minguo calendar||1096 before ROC|
|Seleucid era||1127/1128 AG|
|Thai solar calendar||1358–1359|
942 or 561 or −211
— to —
943 or 562 or −210
- October 5 – King Louis the Pious (son of Charlemagne) is crowned emperor of the Holy Roman Empire, by Pope Stephen IV at Reims. He also crowns the emperor's wife Ermengarde as Holy Roman Empress. The ceremony in Reims re-establishes the principle of papal supremacy, by recognising the importance of the pope in imperial coronations. Louis gives the pope many gifts, including the estate tax Vendeuvre, near Troyes (Northern France).
- Battle of Pancorbo: A Moorish army from the Emirate of Córdoba is sent by Emir Al-Hakam I, to take control of the pass at Pancorbo. They defeat the army of Asturian-Basque Frankish vassals.
- Winter – The Basques, supported by the Moors, cross the Garonne River and revolt against the Franks in Gascony (north of the Pyrenees).
- King Hywel of Gwynedd is attacked by his brother Cynan on Anglesey (modern Wales), who is killed during the fighting (approximate date).
- Babak Khorramdin, Persian military leader, revolts against the Abbasid Caliphate in Azerbaijan (approximate date).
- Synod of Aachen: Louis the Pious calls for a council about the regulations (Institutio canonicorum Aquisgranensis) for monastic life in the Frankish Empire.
- Synod of Chelsea: King Coenwulf of Mercia calls for a council about his right to appoint abbots and monasteries in England.
- June 12 – Pope Leo III dies after a 20-year reign, and is succeeded by Stephen IV as the 97th pope of Rome.
- Al-Wathiq, caliph of the Abbasid Caliphate (d. 847)
- Formosus, pope of the Catholic Church (approximate date)
- Henjō, Japanese waka poet (d. 890)
- June 12 – Leo III, pope of the Catholic Church (b. 750)
- October 28 – Beggo, count of Toulouse and Paris
- Cynan Dindaethwy, king of Gwynedd (Wales)
- Fātimah bint Mūsā, Muslim saint (b. 790)
- Harthama ibn A'yan, Muslim governor
- Hildoard, archbishop of Cambrai
- Li He, Chinese poet (b. 790)
- Empress Dowager Wang (Xianzong), Chinese empress
- Wulfar, archbishop of Reims
- Salvador Miranda (1998). The Cardinals of the Holy Roman Church: Pope Stefano IV (815–817).
- Sánchez Albornoz, Claudio; Claudio Sánchez Albornoz. Problems del Reino de Navarra del siglo IX. p. 16.
- Islam and Europe Timeline (355–1291 AD).