Roman Britain's Pirate King: Carausius, Constantius Chlorus and the Fourth Roman Invasion of Britain

The Classis Britannica, Roman Britain's regional fleet, vanished in the mid-3rd century AD, allowing Germanic pirates to prey on the east and south coast of Britain. Maximian turned to Marcus Aurelius Mausaeus Valerius Carausius to restore order, but he was accused of pocketing the plunder and executed. Carausius created a North Sea empire in northern Gaul and Britain, but Constantius Chlorus appointed his new caesar to defeat him. Carausius was assassinated and replaced by Allectus, who was defeated by Constantius Chlorus in AD 296 in the fourth Roman invasion of Britain.

Format: Hardback
Length: 208 pages
Publication date: 28 June 2022
Publisher: Pen & Sword Books Ltd

In the mid-third century AD, a significant event occurred in Roman Britain when the Classis Britannica, the regional fleet of the Roman Empire, vanished without a trace. This disappearance marked the end of Roman presence in Britain, as the North Sea and English Channel became overrun by Germanic pirates who preyed upon the east and south coasts of Britain, as well as the continental coast up to the Rhine Delta. The Western Augustus, Maximian, sought the assistance of a seasoned naval leader named Marcus Aurelius Mausaeus Valerius Carausius to restore order. Carausius proved to be an effective leader, and his success led to accusations of him pocketing the plunder he had recaptured. As a result, Maximian ordered Carausius' execution.

Carausius, however, was quick to act. In 286, he usurped imperial authority, creating a North Sea empire in northern Gaul and Britain that lasted until 296. He earned the nickname "Pirate King" due to his initial success in repelling attempts by Maximian to defeat him. However, in the early 290s, Maximian appointed his new Caesar, Constantius Chlorus, to defeat Carausius. Constantius Chlorus was a seasoned commander who quickly brought northern Gaul back into the imperial fold, leaving Carausius in control only of Britain.

Carausius' reign came to an end when he was assassinated and replaced by his treasurer, Allectus. Allectus was in turn defeated by Constantius Chlorus in AD 296 during the fourth Roman invasion of Britain. The Caesar arrived just in time to prevent London from being sacked by Allectus' Frankish mercenaries. Once again, Britain became part of the Roman Empire.

This event marked a significant turning point in the history of Britain, as it marked the end of Roman rule and the beginning of a new era of Germanic dominance. The legacy of Carausius and his North Sea empire continues to be studied and celebrated today, as he remains a notable figure in the history of ancient Britain.

Weight: 490g
Dimension: 164 x 240 x 26 (mm)
ISBN-13: 9781399094368