878 deaths

King of the Picts

thumb|alt=Refer to caption|right|Ubba's name as it appears on folio 48verso|v of British Library Harley 2278 (Lives of Saints Edmund and Fremund): "''''"

King of Gwynedd who unified much of Wales and defeated Viking incursions (820–878)

Prince of Benevento

Amoghavarsha Nrupatunga (–878), also known as Amoghavarsha I, was the Rashtrakuta emperor from 814 until his death in 878. He is considered by many historians to be the greatest emperor of the Rashtrakuta dynasty. His reign of 64 years is one of the longest precisely dated monarchical reigns on record. Many Kannada and Sanskrit scholars prospered during his rule, including the great Indian Jain mathematician Mahaviracharya who wrote the Ganita-sara-samgraha, Shakatayan and Srivijaya (a Jain Kannada language theorist), as well as Jain Monks like Acharya Jinasena and Acharya Virasena, Acharya Gu

9th-century Persian Muslim scholar

Irish monk

French noble

Chinese rebel

An unnamed son of Domagoj, according to older historiography named Iljko which is probably an erroneous translation of , was a duke ('''') in Croatia from 876 until 878.

Muslim historian