The Battle of Deorham is portrayed by the Anglo-Saxon Chronicle as an important military encounter between the West Saxons and the Britons in the West Country in 577. The Chronicle depicts the battle as a major victory for Wessex's forces, led by Ceawlin and one Cuthwine, resulting in the capture of the Romano-British towns of Glevum (Gloucester), Corinium Dobunnorum (Cirencester), and Aquae Sulis (Bath).

Glevum was originally a Roman fort in Roman Britain that became a "colonia" of retired legionaries in AD 97. Today, it is known as Gloucester, in the English county of Gloucestershire. The name Glevum is taken by many present-day businesses in the area and also by the 26-mile Glevum Way, a long-distance footpath or recreational walk encircling modern Gloucester.