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How did Carausius rule Britain as a separate empire?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
Historical map of ancient Britain featuring three sections: a main map of Roman Britain showing Roman roads, frontier walls, principal settlements, forts, mines, and key tribal regions; an inset of prehistoric Britain marking Neolithic, Mesolithic, and Bronze/Iron Age sites; and a smaller map illustrating the stages of Roman conquest with color-coded tribal territories and years of conquest.
Roman Britain

Marcus Aurelius Mausaeus Carausius, a Roman naval commander, established an independent state in Britain by leveraging his control over the Classis Britannica, a powerful fleet based at Gesoriacum. After being accused of corruption and ordered to face execution by the emperor Maximian, Carausius fled with his troops to Britain around 286–287 CE.12

He solidified his rule through several strategic actions:
* Military Consolidation: He declared himself Augustus and trained local populations to serve as sailors, effectively securing the western seas.1
* Territorial Expansion: Beyond Britain, he extended his authority into Gaul as far as Rotomagus.1
* Diplomatic Recognition: Following failed attempts by the central Roman government to dislodge him, Diocletian and Maximian were forced to acknowledge his rule in 290 CE.1

Carausius maintained this breakaway empire until 293 CE, when he was murdered by his finance minister, Allectus, who subsequently ruled for three years before the province was reclaimed by Constantius I.12