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The 820s decade ran from January 1, 820, to December 31, 829.
- 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, Brani?evo, 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).
- Adalbert I, Frankish margrave (approximate date)
- Adelaide of Tours, Frankish noblewoman (approximate date)
- Álmos, military leader (gyula) of the Hungarians (approximate date)
- Anandavardhana, Indian philosopher (d. 890)
- Ashot I ("the Great"), king of Armenia (approximate date)
- Buhturi, Syrian poet (d. 897)
- Godfrid Haraldsson, Danish Viking king (approximate date)
- Grimbald, Frankish Benedictine monk (d. 901)
- Hucbert, Frankish nobleman (d. 864)
- Ibn Khordadbeh, Persian geographer (approximate date)
- Qusta ibn Luqa, Syrian Melkite physician (d. 912)
- Ranulf I of Aquitaine, Frankish nobleman (d. 866)
- Rhodri the Great, king of Gwynedd (Wales) (approximate date)
- September 14, Li Yong, chancellor of the Tang Dynasty
- December 25, Leo V, emperor of the Byzantine Empire (b. 775)
- Adi Shankara, Indian philosopher and theologian (b. 788)
- Causantín mac Fergusa, king of the Picts
- Huangfu Bo, chancellor of the Tang Dynasty
- Lupo III, duke of Gascony (approximate date)
- Muhammad ibn Idris al-Shafi'i, Muslim imam (b. 767)
- Olcobhar mac Cummuscach, abbot of Clonfert
- Song Ruoxin, Chinese scholar and poet (b. 768)
- Tnúthgal mac Donngaile, king of Munster
- Tutu Chengcui, eunuch and advisor of the Tang Dynasty
- Wang Chengzong, general of the Tang Dynasty
- Xian Zong, emperor of the Tang Dynasty (b. 778)
- April 7 – George the Standard-Bearer, archbishop of Mytilene (b. c. 776)
- May 2 – Liu Zong, general of the Tang Dynasty
- December 18 – Theodulf, bishop of Orléans
- Arno, archbishop of Salzburg
- Artrí mac Cathail, king of Munster (Ireland)
- Benedict of Aniane, Frankish monk
- Borna, duke (knez) of Croatia
- Coenwulf, king of Mercia
- Egbert, bishop of Lindisfarne
- Guisclafred, Frankish nobleman (approximate date)
- Li Su, general of the Tang dynasty (b. 773)
- Tian Hongzheng, general of the Tang dynasty (b. 764)
- Wei Guanzhi, chancellor of the Tang dynasty (b. 760)
- Zheng Yuqing, chancellor of the Tang dynasty (b. 746)
- June 26 – Saich?, Japanese Buddhist monk (b. 767)
- Al-Hakam I, Muslim emir of Córdoba (b. 771)
- Al-Waqidi, Muslim historian and biographer
- Denebeorht, bishop of Worcester
- Eigil of Fulda, Bavarian abbot
- Gregory Pterotos, Byzantine general (strategos)
- Kim Heon-chang, Silla aristocrat and rebel leader
- Li Yijian, chancellor of the Tang Dynasty (b. 756)
- Tahir ibn Husayn, founder of the Tahirid Dynasty
- Tian Bu, general of the Tang Dynasty (b. 785)
- Winiges, duke of Spoleto (Italy)
- Adelochus, archbishop of Strasbourg (b. 786)
- Boniface I, margrave of Tuscany
- Ceolwulf I, king of Mercia (approximate date)
- Gondulphus, bishop of Metz
- Han Hong, general of the Tang Dynasty b. 765)
- Ljudevit Posavski, duke of Croatia
- Thekla, Byzantine empress (approximate date)
- Thomas the Slav, Byzantine general and usurper
- Timothy I, Syrian patriarch
- Wulfheard, bishop of Hereford (approximate date)
- February 11 – Paschal I, pope of the Catholic Church
- March 5 – Suppo I, Frankish nobleman
- August 5 – Heizei, emperor of Japan (b. 773)
- Adelard, duke of Spoleto (Italy)
- Han Yu, Chinese philosopher and poet (b. 768)
- Mauring, Frankish nobleman
- Mu Zong, emperor of the Tang Dynasty (b. 795)
- Óengus of Tallaght, Irish bishop
- Ruthmael, Irish abbot and bishop
- Sayyida Nafisa, Arab female scholar (b. 762)
- Wetti of Reichenau, German scholar
- Zhang Hongjing, Chinese chancellor (b. 760)
- Abu Ubaidah, Muslim scholar (b. 728)
- Hywel ap Rhodri, king of Gwynedd (Wales)
- Ida of Herzfeld, Frankish noblewoman (approximate date)
- Liu Wu, general of the Tang Dynasty
- Máel Bressail mac Ailillo, king of Ulaid (Ireland)
- Song Ruozhao, Chinese scholar, lady-in-waiting and poet (b. 770)
- Rampon, count of Barcelona
- Welf, father of Judith of Bavaria
- Wihomarc, Breton chieftain
- Ashot I, prince of Iberia (or 830)
- Ashot Msaker, prince of Armenia
- Bai Xingjian, Chinese poet and writer (b. 776)
- Beornwulf, king of Mercia
- Fujiwara no Fuyutsugu, Japanese general (b. 775)
- Heondeok, king of Silla (Korea)
- Li Guangyan, Chinese general (b. 761)
- Li Wu, prince of the Tang Dynasty
- Theodore the Studite, Byzantine abbot (b. 759)
- Wu Yantong, Chinese Buddhist monk
- Zhu Kerong, Chinese governor (jiedushi)
- 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)
- June 1 – Li Tongjie, general of the Tang Dynasty
- July 30 – Shi Xiancheng, general of the Tang Dynasty
- October 2 – Michael II, emperor of the Byzantine Empire (b. 770)
- Abu al-Razi Muhammad, Muslim governor
- Cináed mac Mugróin, king of Uí Failghe
- Cui Zhi, chancellor of the Tang Dynasty (b. 772)
- Giustiniano Participazio, doge of Venice
- Leibulf of Provence, Frankish nobleman
- Li Yi, Chinese poet (or 827)
- Li You, general of the Tang Dynasty
- Muiredach mac Ruadrach, king of Leinster
- 'Umayr ibn al-Walid, Muslim governor
- Wei Chuhou, chancellor of the Tang Dynasty (b. 773)
- Zheng Yin, chancellor of the Tang Dynasty (b. 752)
- ^ Theophanes Continuatus, pp. 40-41.
- ^ Mladjov, Ian. "Croatian Rulers" (PDF). Retrieved .
- ^ Bury 1912, pp. 101-102; Lemerie 1965, pp. 279-281, 291; Treadgold 1988, p. 240.
- ^ McKitterick, Rosamond, The New Cambridge History, 700-900.
- ^ Bury 1912, pp. 105-106; Treadgold 1988, pp. 241-242.
- ^ Stenton, Anglo-Saxon England, p. 231.
- ^ "Brief history of Sicily" (PDF). Archaeology.Stanford.edu. 7 October 2007.
- ^ Peter Sammartino and William Roberts, Sicily: An Informal History, p. 43.
- ^ Gilbert Meynier (2010) L'Algérie coeur 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.
- ^ Treadgold (1988), pp. 253-254.
- ^ Vasiliev (1935), pp. 83-84.
- ^ Rucquoi, Adeline (1993). Histoire médiévale de la Péninsule ibérique. Paris: Seuil. p. 86. ISBN 2-02-012935-3.
- ^ Donald M. Nicol, Byzantium and Venice: A study in diplomatic and cultural relations (Cambridge: University Press, 1988), p. 24.
- ^ Klein, "Adalram".
- ^ Timothy E. Gregory, A History of Byzantium, (Blackwell Publishing Ltd, 2010), p. 227.
- ^ Treadgold, Warren (1988). The Byzantine Revival, 780-842, Stanford University Press, p. 268. ISBN 0-8047-1462-2.
- ^ Lamb, H. H. (1977) Climate: Present, Past and Future: Climatic History and the Future Vol 2, Methuen and Co. Ltd., London.
- ^ Lynch, Michael (ed.). The Oxford companion to Scottish history. Oxford University Press. p. 70. ISBN 9780199693054.
- ^ Gilbert Meynier (2010) L'Algérie coeur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; p. 28.