Carausian Revolt

The Carausian Revolt (286-296 CE) is also known as the Britannic Empire which was independent for 10 years.
Carausius led a Revolt that made Britannia independent from Rome for the 10 years between 286-296 CE.

The Britannic Empire started thirteen years after the collapse of the Gallic Empire (260-274 CE).

Carausius was from the Menapii tribe in Germania Inferior. He started out as a pilot, navigating vessels to shore.
In 286 CE, He was part of Maximian‘s campaign against the Bagaudae in northern Gaul, where he distinguished himself.
As a result, Maximian made him Commander of the Classis Britannica, the Fleet in the North Sea, with instructions to defeat the Saxon and Frankish pirates.
However, during 287 or 288 CE, Maximian learnt that Carausius was working with the pirates, and not against them. As a consequence, he ordered Carausius‘ execution.

On hearing of the order to execute him, Carausius acted immediately and declared Britannia to be Independent and himself as ‘Emperor of the North’.
The Carausian Revolt (286-296 CE) occurred 13 years after the demise of the Gallic Empire.
Carausius seceded Britannia from Rome, along with northern Gaul.
He held the three British Legions, the British Fleet and another Legion from Gaul, along with various mercenary units.

Maximian mustered an invasion force between 288-289 CE.
In 293 CE, Constantius I Chlorus was promoted to Caesar by Maximian, was sent to retake Britannia.
His Legions moved into Gaul, capturing Boulogne and retaking the Rhine Delta.

However, before he could build a fleet to invade Britannia, Carausius was assassinated by Allectus his finance minister.
Allectus then ruled Britannia for another three years.

Finally, an invasion fleet sailed in 296 CE from Boulogne commanded by Constantius I Chlorus.
Another fleet sailed in fog around the Isle of Wight, commanded by Julius Asclepiodotus.
The invasion force landed and moved towards London where Allectus was overthrown and Britannia returned to Roman Rule.

Boulogne