(Constantius Chlorus) (d. 306), Caesar (deputy emperor) and then Augustus (emperor) of the western Roman empire (ad 292–306). In 293 Constantius wrested power from the usurper Carausius. Carausius was assassinated by Allectus who in turn usurped imperial power. Constantius' forces attacked Allectus in Britain; Allectus was killed and Constantius made a triumphal entry into London. In ad 305–6 Constantius, then co‐emperor with Maximian, conducted a campaign in northern Britain. His son Constantine joined him, and was declared emperor when Constantius died at York.
Subjects: Classical Studies — History.