827

Decades: 770s 780s 790s 800s 810s - 820s - 830s 840s 850s 860s 870s

Years: 822 823 824 825 826 - 827 - 828 829 830 831 832

• Succession of Pope Valentine, then Pope Gregory IV.
• Arabs invade Sicily.
• The royal ceremonial centre at Copán is abandoned.
• Chalid Ben Abdulmelik and Ali Ben Isa measure the size of the Earth.

• Saint Cyril, scholar, theologian and linguist
• Emperor Montoku of Japan

• Pope Eugene II
• September: Pope Valentine