Years: 865 866 867 868 - 869 - 870 871 872 873

Decades: 830s 840s 850s - 860s - 870s 880s 890s

Centuries: 8th century - 9th century - 10th century

Events

• Western Emperor Louis II allies with eastern Emperor Basil I against the Saracens.
• Charles the Bald tries to take the kingdom of Lothair II of Lotharingia after the latter's death, but finds resistance from Louis the German
• The Fourth Council of Constantinople (5 October 869-28 February 870) is called to decide about what to do about the deposed patriarch Photius.

Births

• Emperor Yozei of Japan
• Ethelfleda, Lady of the Mercians (approximate date)

Deaths

• 4 February - Saint Cyril
• 8 August - Lothair II of Lotharingia