780
| Years: 776 777 778 779 - 780 - 781 782 783 784 | |
| Decades: 750s 760s 770s - 780s - 790s 800s 810s | |
| Centuries: 7th century - 8th century - 9th century | |
Events
- Constantine VI becomes Byzantine Emperor with Irene as guardian.
- Tang De Zong becomes emperor of China.
- Drest III succeeds Alpin II as king of the Picts.
- The city of Osnabrück is founded by Charlemagne (approximate date)
- al-Khwarizmi, Muslim mathematician (approximate date)
- February 7 - Nicetas, Patriarch of Constantinople
- September 8 - Leo IV, Byzantine Emperor