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|837 by topic|
|Ab urbe condita||1590|
|Balinese saka calendar||758–759|
|Chinese calendar||丙辰年 (Fire Dragon)
3533 or 3473
— to —
丁巳年 (Fire Snake)
3534 or 3474
|- Vikram Samvat||893–894|
|- Shaka Samvat||758–759|
|- Kali Yuga||3937–3938|
|Japanese calendar||Jōwa 4
|Minguo calendar||1075 before ROC
|Seleucid era||1148/1149 AG|
|Thai solar calendar||1379–1380|
963 or 582 or −190
— to —
964 or 583 or −189
|Wikimedia Commons has media related to 837.|
- Byzantine–Arab War: Emperor Theophilos leads a Byzantine expeditionary force (70,000 men) into Mesopotamia. He sacks the cities Arsamosata and Sozopetra—which some sources claim as the birthplace of Abbasid caliph Al-Mu'tasim—and forces Melitene to pay tribute.
- The Slavs in the vicinity of Thessaloniki revolt against the Byzantine Empire. Theophilos undertakes an evacuation of some Byzantine captives, who are settled in trans-Danubian Bulgaria.
- Presian I, ruler (khan) of the Bulgarian Empire, sends his prime-minister Isbul against the Smolyani (a Slavic tribe in Byzantine territory near the Struma River). The Bulgarian army campaigns along the Aegean coasts, and conquers most of Thrace and Macedonia, including the fortress city of Philippi (see Presian Inscription).
- The city of Naples (modern Italy) is attacked by Saracens from Egypt demanding an annual payment (approximate date).
- King Drest IX dies after a 3-year reign. He is succeeded by his cousin Eóganan, as ruler of the Picts.
- Al-Muntasir, Muslim caliph (d. 862)
- Baldwin I, margrave of Flanders (approximate date)
- Ibn Duraid, Muslim poet and philologist (d. 933)
- Ibn Khuzaymah, Muslim hadith and scholar (d. 923)
- Antony I, patriarch of Constantinople
- Drest IX, king of the Picts
- Eadwulf, bishop of Lindsey
- Giovanni I, doge of Venice
- Hugh of Tours, Frankish nobleman
- Li Zaiyi, general of the Tang Dynasty (b. 788)
- Maxentius, patriarch of Aquileia
- Oliba I, Frankish nobleman
- Peter of Atroa, Byzantine abbot (b. 773)