286 CE
Emperor Diocletian campaigns successfully against Sarmatian raids. The future emperor Constantius defeats the 'Bosporian Sarmatians'. Chaekgye becomes king of the Korean kingdom of Baekje. Summer: Carausius, commander of the Classis Britannica, is accused of piracy by Maximian and is sentenced to death. He responds by declaring himself emperor of Britain and Northwestern Gaul. His forces consist of the newly built Roman fleet and three legions in Britain. The Carausian Revolt is supported by Gaulish merchant ships and Frankish mercenaries.
Geopolitics & Diplomacy
- April 1 – Diocletian rewards Maximian by elevating him to co-emperor, giving him the title Augustus.source
Conflict & Security
- Tuoba Chuo succeeds his brother Tuoba Xilu as chieftain of the Tuoba clan.source
- Emperor Diocletian campaigns successfully against Sarmatian raids. The future emperor Constantius defeats the 'Bosporian Sarmatians'.source
- Chaekgye becomes king of the Korean kingdom of Baekje.source
- Winter/Spring: The Caesar Maximian defeats the Bagaudae rebellion in Gaul. He then defeats a Germanic invasion into Gaul, defeating an army of Burgundians and Alemanni and another army of Chaibones and Heruli.source
Crime & Justice
- Summer: Carausius, commander of the Classis Britannica, is accused of piracy by Maximian and is sentenced to death. He responds by declaring himself emperor of Britain and Northwestern Gaul. His forces consist of the newly built Roman fleet and three legions in Britain. The Carausian Revolt is supported by Gaulish merchant ships and Frankish mercenaries.source