an ancient British tribe centred on the confluence of the Severn and Avon rivers. The Dobuni, who were ruled by a Belgic aristocracy, apparently made peace with the Roman emperor Claudius (reigned AD 41–54). Later, Corinium (Cirencester) was made the capital, and it soon became the second largest city in Britain. The Dobuni economy was based primarily on beef and wool, and the tribe's prosperity is attested by the remains of numerous villas in the vicinity.