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|805 by topic|
|Ab urbe condita||1558|
|Balinese saka calendar||726–727|
|Chinese calendar||甲申年 (Wood Monkey)
3501 or 3441
— to —
乙酉年 (Wood Rooster)
3502 or 3442
|- Vikram Samvat||861–862|
|- Shaka Samvat||726–727|
|- Kali Yuga||3905–3906|
|Japanese calendar||Enryaku 24
|Minguo calendar||1107 before ROC
|Seleucid era||1116/1117 AG|
|Thai solar calendar||1347–1348|
931 or 550 or −222
— to —
932 or 551 or −221
|Wikimedia Commons has media related to 805.|
- Siege of Patras: Local Slavic tribes of the Peloponnese lay siege to the city of Patras (modern Greece), with aid from an Arab fleet. A Byzantine relief army under Skleros, military governor (strategos) from Corinth, is sent and retakes the city. The captured Slavs in Patras are made slaves, and a church is dedicated to St. Andrew.
- Battle of Canburg: The Franks under Charles the Younger, son of emperor Charlemagne, defeat the Slavs near the present-day town of Kadaň and conquer Bohemia (modern Czech Republic).
- Krum, ruler (khan) of the Bulgarian Empire, conquers and destroys the Eastern part of the Avar Khaganate (approximate date).
- The first known mention of Magdeburg (Saxony-Anhalt), founded by Charlemagne, is made.
- King Egbert of Wessex formally establishes kingship over Devon, after an integration over many years. Dumnonia is reduced to cover only the Cornish in Cornwall (approximate date).
- February 25 – Emperor De Zong dies after a 25-year reign, in which the fanzhen is controlled by military governors or jiedushi, who often ignore imperial decrees. He is succeeded by his son Shun Zong, who becomes ruler of the Tang Dynasty.
- August 31 – Shun Zong issues an edict to yield the throne to his son Xian Zong (Li Chun), because of an illness, taking for himself the title of "Retired Emperor" (Taishang Huang). Xian is confronted with political disputes in Zi Prefecture (Shaanxi).
- Priest Saichō, patriarch of Tendai Buddhism, visits China and introduces tea to Japan on his return (or 804).
- García Íñiguez I, king of Pamplona (approximate date)
- Judith of Bavaria, Frankish empress (d. 843)
- Liudolf, duke of Saxony (approximate date)
- Lupus Servatus, Frankish abbot (approximate date)
- May 12 – Æthelhard, archbishop of Canterbury
- Anselm, duke of Friuli (approximate date)
- Cernach mac Fergusa, king of South Brega (Ireland)
- February 25 – De Zong, emperor of the Tang Dynasty (b. 742)
- Hui-kuo, Chinese Buddhist monk (b. 746)
- Jia Dan, general of the Tang Dynasty (b. 730)
- Muhammad al-Shaybani, Muslim jurist
- Urbicius, Frankish monk (approximate date)
- Wei Gao, general of the Tang Dynasty (b. 745)