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|827 by topic|
|Ab urbe condita||1580|
|Balinese saka calendar||748–749|
|Chinese calendar||丙午年 (Fire Horse)|
3523 or 3463
— to —
丁未年 (Fire Goat)
3524 or 3464
|- Vikram Samvat||883–884|
|- Shaka Samvat||748–749|
|- Kali Yuga||3927–3928|
|Japanese calendar||Tenchō 4|
|Minguo calendar||1085 before ROC|
|Seleucid era||1138/1139 AG|
|Thai solar calendar||1369–1370|
953 or 572 or −200
— to —
954 or 573 or −199
- June 14 – Euphemius, exiled Byzantine admiral, asks for the help of North African Arabs, to retake Sicily and Malta from the Byzantines. Emir Ziyadat Allah I of Ifriqiya promises to return the islands to Euphemius, in exchange for a yearly tribute, and sends an Arab Muslim expeditionary force of 10,000 men under the 70-year-old Asad ibn al-Furat, which lands at Mazara del Vallo in Sicily.
- Fall – Siege of Syracuse: Muslim forces under Asad ibn al-Furat, in support of the rebel Byzantine army, besiege Syracuse, Sicily.
- Summer – Omurtag, ruler (khan) of the Bulgarian Empire, launches an attack to the West, and penetrates into Pannonia. He expels the local chiefs, and installs Bulgar governors over the Slavic tribes to control them. Omurtag conquers the cities of Beograd, Braničevo, Sirmium, and most of eastern Slavonia.
- Giustiniano Participazio deposes his younger brother Giovanni I, and is appointed doge of Venice. Giovanni, who is part of a pro-Frankish faction, is exiled to Zara (modern Croatia).
- Æthelstan establishes himself as king of East Anglia, after killing King Ludeca of Mercia in battle. Ludeca is succeeded by Wiglaf, father-in-law (and probably distant cousin) of the late king Ceolwulf I's daughter.
- Emperor Jing Zong is assassinated by a group of conspirators. He is succeeded by his brother Wen Zong, as ruler of the Tang Dynasty.
- August 27 – Pope Eugene II dies after a 3-year reign, and is succeeded by Valentine as the 100th pope of the Catholic Church.
- October 10 – Pope Valentine dies just after a two-month reign, and is succeeded by Gregory IV as the 101st pope of Rome.
- Chalid Ben Abdulmelik and Ali Ben Isa travel to the Plain of Sinjar (modern Iraq), under orders of Caliph Al-Ma'mun, to measure the size of the Earth.
- The Saracens, who found spinach originally in Persia (modern Iran), introduce the plant to Sicily.
- Ali ibn Muhammad, Muslim sultan (d. 848)
- Cyril, Byzantine missionary and bishop (d. 869)
- Ibn al-Rawandi, Muslim scholar and writer (d. 911)
- Maura of Troyes, Frankish noblewoman and saint (d. 850)
- January 1 – Adalard of Corbie, Frankish abbot
- August 27 – Eugene II, pope of the Catholic Church
- October 10 – Valentine, pope of the Catholic Church
- Agnello Participazio, doge of Venice
- Claudius, archbishop of Turin
- Grigol of Kakheti, Georgian prince
- Guillemundus, Frankish nobleman
- Hildegrim, bishop of Châlons
- Jing Zong, emperor of the Tang Dynasty (b. 809)
- Li Yi, Chinese poet (or 829)
- Ludeca, king of Mercia
- Wu Chongyin, Chinese general (b. 761)
- Yaoshan Weiyan, Chinese Buddhist monk (b. 745)
- Peter Sammartino and William Roberts, Sicily: An Informal History, p. 43.
- Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; p. 23.
- John V.A. Fine, Jr. (1991). The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 107. ISBN 978-0-472-08149-3.
- Rolland, Jacques L.; Sherman, Carol (2006). The Food Encyclopedia. Toronto: Robert Rose. pp. 335–338. ISBN 978-0-778-80150-4.