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This article is about the year 827. For the number, see 827 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||790s 800s 810s – 820s – 830s 840s 850s|
|Years:||824 825 826 – 827 – 828 829 830|
|827 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1580|
|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||749–750|
|- Kali Yuga||3928–3929|
|Japanese calendar||Tenchō 4
|Minguo calendar||1085 before ROC
|Seleucid era||1138/1139 AG|
|Thai solar calendar||1369–1370|
- June 14 – Euphemius, exiled Byzantine admiral, asked the help of the Arabs to retake Sicily and Malta from the Byzantines. Emir Ziyadat Allah I of Ifriqiya promising to give the islands back to Euphemius in exchange for a yearly tribute. He sends an Muslim-Arab expeditionary force (10,000 men) under the 70-year-old Asad ibn al-Furat and lands at Mazara del Vallo.
- Fall – Siege of Syracuse: Muslim forces under Asad ibn al-Furat in support of an rebel Byzantine army besiege Syracuse.
- Summer – Omurtag, ruler (khan) of the Bulgarian Empire, launches an attack to the West and penetrates into Pannonia. He expells 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 introducing spinach to Sicily, who found the plant originally in Persia (modern Iran).
- January 1 – Adalard of Corbie, Frankish abbot
- August 27 – Eugene II, pope of the Catholic Church
- Guillemundus, Frankish nobleman
- Hildegrim, bishop of Châlons
- Jing Zong, emperor of the Tang Dynasty (b. 809)
- Ludeca, king of Mercia
- October 10 – Valentine, pope of the Catholic Church
- 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.