780

Centuries: 7th century - 8th century - 9th century

Decades: 730s 740s 750s 760s 770s - 780s - 790s 800s 810s 820s 830s

Years: 775 776 777 778 779 - 780 - 781 782 783 784 785

• 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 (date not entirely secure).

Births

• al-Khwarizmi, Muslim mathematician (approximate date)

Deaths

• Leo IV, Byzantine Emperor