What was the name of the pirate captain that Constantius Chlorus fought?

The name of the pirate captain that Constantius Chlorus fought was Carausius. Carausius was a significant figure during the later part of the Roman Empire, particularly known for his role as a usurper and self-styled Emperor of Britain and northern Gaul. He had previously been a naval commander tasked with stopping the Saxon pirates from raiding the coasts of Britain. However, after he allegedly embezzled funds and was accused of collusion with the very pirates he was meant to combat, he declared himself emperor, leading to conflict with Constantius Chlorus, who was tasked with dealing with him. This conflict showcases the complexities of power and control during a time when pirate activities were a significant threat to Roman interests.