History
878
General
Population: 226 Million*
- Astronomy: Arab astronomer Battani begins observations
- Deaths: Welsh prince Rhodri Mawr
Europe
- England: Alfred of England defeats Vikings under Gudrum (Guthrum) at Ethandune (Edington) – treaty of Wedmore divides England between them –
Alfred retakes London from Danes – Treaty of Chippenham
Deira under Norse control
- Italian States: Arabs conquer whole of Sicily from Byzantines – Palermo new capital
- Wales: End of reign of Rhodri Mawr, first prince of all Wales, killed by Vikings