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Events

Battle of Krasos: Emperor Nikephoros I refuses to pay the tribute imposed by Caliph Harun al-Rashid of the Abbasid Caliphate. A 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.
Abbasid caliph Harun al-Rashid marries Abbasa, the daughter of Abbasid prince and official Sulayman.
Europe
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 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 flees to Mantua, where he is killed.
The Gymnasium Carolinum in Osnabrück is founded by Charlemagne.
Asia
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.
Priest Saichō, patriarch of Tendai Buddhism, visits China and reportedly brings back tea seeds.
The Inscription of Sukabumi from Eastern Java marks the beginning of the Javanese language.
By topic

Ludger, Frisian missionary, becomes the first bishop of Münster, and builds a monastery there.