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This article is about the year 804. For the number, see 804 (number). For other uses, see 804 (disambiguation).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||770s 780s 790s – 800s – 810s 820s 830s|
|Years:||801 802 803 – 804 – 805 806 807|
|804 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1557|
|Chinese calendar||癸未年 (Water Goat)
3500 or 3440
— to —
甲申年 (Wood Monkey)
3501 or 3441
|- Vikram Samvat||860–861|
|- Shaka Samvat||726–727|
|- Kali Yuga||3905–3906|
|Japanese calendar||Enryaku 23
|Minguo calendar||1108 before ROC
|Seleucid era||1115/1116 AG|
|Thai solar calendar||1346–1347|
- Battle of Krasos: Emperor Nikephoros I refuses to pay tribute imposed by caliph Harun al-Rashid of the Abbasid Caliphate. An Muslim-Arab expeditionary force invades Asia Minor. During a surprise attack, Nikephoros suffers a major defeat against the Saracens at Krasos in Phrygia. According to Arabian sources, the Byzantines lose 40,700 men and 4,000 pack animals, while Nikephoros himself is almost killed; but saved by the bravery of his officers.
- Summer – Emperor Charlemagne finishes the conquest of Saxony. The Carolingian administration in the north is restored and the diocese of Bremen is re-established. Venice, torn by infighting, switches the allegiance from Constantinople to king Pepin of Italy, son of Charlemagne.
- Obelerio degli Antenori becomes the ninth doge of Venice after his predecessor Giovanni Galbaio is fled to Mantua where he is killed.
- The Gymnasium Carolinum in Osnabrück is founded by Charlemagne. It becomes the oldest school in Germany.
- Kūkai, Japanese Buddhist monk, travels in a government-sponsored expedition to China in order to learn more about the Mahavairocana Sutra. He brings back texts of Shingon (Esoteric Buddhism).
- Priest Saichō, patriarch of Tendai Buddhism, visits China and reportedly brings back tea seeds (or 805).
- The Inscription of Sukabumi from Eastern Java marks the beginning of the Javanese language.
- May 19 – Alcuin, bishop and advisor to Charlemagne
- Giovanni Galbaio, doge of Venice (approximate date)
- Lu Yu, Chinese author of The Classic of Tea (b. 733)
- October 1 – Richbod, archbishop of Trier
- Bosworth 1989, p. 248; Mango & Scott 1997, p. 660
- Treadgold 1988, p. 135
- David Nicolle (2014). The Conquest of Saxony AD 782–785, p. 83. ISBN 978-1-78200-825-5
- The building of the Gymnasium Carolinum, Osnabrück Accessed October 2008